apps/silcd/command.c

   1 /*
   2
   3   command.c
   4
   5   Author: Pekka Riikonen <priikone@silcnet.org>
   6
   7   Copyright (C) 1997 - 2003 Pekka Riikonen
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; version 2 of the License.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18 */
  19 /* $Id$ */
  20
  21 #include "serverincludes.h"
  22 #include "server_internal.h"
  23
  24 static int silc_server_is_registered(SilcServer server,
  25                                      SilcSocketConnection sock,
  26                                      SilcServerCommandContext cmd,
  27                                      SilcCommand command);
  28 static void
  29 silc_server_command_send_status_reply(SilcServerCommandContext cmd,
  30                                       SilcCommand command,
  31                                       SilcStatus status,
  32                                       SilcStatus error);
  33 static void
  34 silc_server_command_send_status_data(SilcServerCommandContext cmd,
  35                                      SilcCommand command,
  36                                      SilcStatus status,
  37                                      SilcStatus error,
  38                                      SilcUInt32 arg_type,
  39                                      const unsigned char *arg,
  40                                      SilcUInt32 arg_len);
  41 static bool
  42 silc_server_command_pending_error_check(SilcServerCommandContext cmd,
  43                                         SilcServerCommandReplyContext cmdr,
  44                                         SilcCommand command);
  45 SILC_TASK_CALLBACK(silc_server_command_process_timeout);
  46
  47 /* Server command list. */
  48 SilcServerCommand silc_command_list[] =
  49 {
  50   SILC_SERVER_CMD(whois, WHOIS, SILC_CF_LAG | SILC_CF_REG),
  51   SILC_SERVER_CMD(whowas, WHOWAS, SILC_CF_LAG | SILC_CF_REG),
  52   SILC_SERVER_CMD(identify, IDENTIFY, SILC_CF_LAG | SILC_CF_REG),
  53   SILC_SERVER_CMD(nick, NICK, SILC_CF_LAG_STRICT | SILC_CF_REG),
  54   SILC_SERVER_CMD(list, LIST, SILC_CF_LAG_STRICT | SILC_CF_REG),
  55   SILC_SERVER_CMD(topic, TOPIC, SILC_CF_LAG | SILC_CF_REG),
  56   SILC_SERVER_CMD(invite, INVITE, SILC_CF_LAG | SILC_CF_REG),
  57   SILC_SERVER_CMD(quit, QUIT, SILC_CF_LAG | SILC_CF_REG),
  58   SILC_SERVER_CMD(kill, KILL, SILC_CF_LAG_STRICT | SILC_CF_REG | SILC_CF_OPER),
  59   SILC_SERVER_CMD(info, INFO, SILC_CF_LAG | SILC_CF_REG),
  60   SILC_SERVER_CMD(stats, STATS, SILC_CF_LAG | SILC_CF_REG),
  61   SILC_SERVER_CMD(ping, PING, SILC_CF_LAG | SILC_CF_REG),
  62   SILC_SERVER_CMD(oper, OPER, SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER),
  63   SILC_SERVER_CMD(join, JOIN, SILC_CF_LAG_STRICT | SILC_CF_REG),
  64   SILC_SERVER_CMD(motd, MOTD, SILC_CF_LAG | SILC_CF_REG),
  65   SILC_SERVER_CMD(umode, UMODE, SILC_CF_LAG | SILC_CF_REG),
  66   SILC_SERVER_CMD(cmode, CMODE, SILC_CF_LAG_STRICT | SILC_CF_REG),
  67   SILC_SERVER_CMD(cumode, CUMODE, SILC_CF_LAG | SILC_CF_REG),
  68   SILC_SERVER_CMD(kick, KICK, SILC_CF_LAG_STRICT | SILC_CF_REG),
  69   SILC_SERVER_CMD(ban, BAN, SILC_CF_LAG_STRICT | SILC_CF_REG),
  70   SILC_SERVER_CMD(detach, DETACH, SILC_CF_LAG_STRICT | SILC_CF_REG),
  71   SILC_SERVER_CMD(watch, WATCH, SILC_CF_LAG | SILC_CF_REG),
  72   SILC_SERVER_CMD(silcoper, SILCOPER,
  73                   SILC_CF_LAG | SILC_CF_REG | SILC_CF_SILC_OPER),
  74   SILC_SERVER_CMD(leave, LEAVE, SILC_CF_LAG_STRICT | SILC_CF_REG),
  75   SILC_SERVER_CMD(users, USERS, SILC_CF_LAG | SILC_CF_REG),
  76   SILC_SERVER_CMD(getkey, GETKEY, SILC_CF_LAG | SILC_CF_REG),
  77
  78   SILC_SERVER_CMD(connect, PRIV_CONNECT,
  79                   SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER),
  80   SILC_SERVER_CMD(close, PRIV_CLOSE,
  81                   SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER),
  82   SILC_SERVER_CMD(shutdown, PRIV_SHUTDOWN, SILC_CF_LAG | SILC_CF_REG |
  83                   SILC_CF_OPER),
  84
  85   { NULL, 0 },
  86 };
  87
  88 /* Performs several checks to the command. It first checks whether this
  89    command was called as pending command callback. If it was then it checks
  90    whether error occurred in the command reply where the pending command
  91    callback was called.
  92
  93    It also checks that the requested command includes correct amount
  94    of arguments. */
  95 #define SILC_SERVER_COMMAND_CHECK(command, context, min, max)                \
  96 do {                                                                         \
  97   SilcUInt32 _argc;                                                          \
  98                                                                              \
  99   if (silc_server_command_pending_error_check(cmd, context2, command)) {     \
 100     SILC_LOG_DEBUG(("Error occurred in command reply, command not called")); \
 101     silc_server_command_free(cmd);                                           \
 102     return;                                                                  \
 103   }                                                                          \
 104                                                                              \
 105   _argc = silc_argument_get_arg_num(cmd->args);                              \
 106   if (_argc < min) {                                                         \
 107     SILC_LOG_DEBUG(("Not enough parameters in command"));                    \
 108     silc_server_command_send_status_reply(cmd, command,                      \
 109                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS, \
 110                                           0);                                \
 111     silc_server_command_free(cmd);                                           \
 112     return;                                                                  \
 113   }                                                                          \
 114   if (_argc > max) {                                                         \
 115     SILC_LOG_DEBUG(("Too many parameters in command"));                      \
 116     silc_server_command_send_status_reply(cmd, command,                      \
 117                                           SILC_STATUS_ERR_TOO_MANY_PARAMS,   \
 118                                           0);                                \
 119     silc_server_command_free(cmd);                                           \
 120     return;                                                                  \
 121   }                                                                          \
 122 } while(0)
 123
 124 /* Returns TRUE if the connection is registered. Unregistered connections
 125    usually cannot send commands hence the check. */
 126
 127 static int silc_server_is_registered(SilcServer server,
 128                                      SilcSocketConnection sock,
 129                                      SilcServerCommandContext cmd,
 130                                      SilcCommand command)
 131 {
 132   SilcIDListData idata = (SilcIDListData)sock->user_data;
 133
 134   if (!idata)
 135     return FALSE;
 136
 137   if (idata->status & SILC_IDLIST_STATUS_REGISTERED)
 138     return TRUE;
 139
 140   silc_server_command_send_status_reply(cmd, command,
 141                                         SILC_STATUS_ERR_NOT_REGISTERED, 0);
 142   return FALSE;
 143 }
 144
 145 /* Internal context to hold data when executed command with timeout. */
 146 typedef struct {
 147   SilcServerCommandContext ctx;
 148   SilcServerCommand *cmd;
 149 } *SilcServerCommandTimeout;
 150
 151 /* Timeout callback to process commands with timeout for client. Client's
 152    commands are always executed with timeout. */
 153
 154 SILC_TASK_CALLBACK(silc_server_command_process_timeout)
 155 {
 156   SilcServerCommandTimeout timeout = (SilcServerCommandTimeout)context;
 157   SilcClientEntry client = (SilcClientEntry)timeout->ctx->sock->user_data;
 158
 159   if (!client) {
 160     SILC_LOG_DEBUG(("Client entry is invalid"));
 161     silc_server_command_free(timeout->ctx);
 162     silc_free(timeout);
 163     return;
 164   }
 165
 166   /* Update access time */
 167   client->last_command = time(NULL);
 168
 169   if (!(timeout->cmd->flags & SILC_CF_REG)) {
 170     SILC_LOG_DEBUG(("Calling %s command",
 171                     silc_get_command_name(timeout->cmd->cmd)));
 172     timeout->cmd->cb(timeout->ctx, NULL);
 173   } else if (silc_server_is_registered(timeout->ctx->server,
 174                                        timeout->ctx->sock,
 175                                        timeout->ctx,
 176                                        timeout->cmd->cmd)) {
 177     SILC_LOG_DEBUG(("Calling %s command",
 178                     silc_get_command_name(timeout->cmd->cmd)));
 179     timeout->cmd->cb(timeout->ctx, NULL);
 180   } else {
 181     SILC_LOG_DEBUG(("Client is not registered"));
 182     silc_server_command_free(timeout->ctx);
 183   }
 184
 185   silc_free(timeout);
 186 }
 187
 188 /* Processes received command packet. */
 189
 190 void silc_server_command_process(SilcServer server,
 191                                  SilcSocketConnection sock,
 192                                  SilcPacketContext *packet)
 193 {
 194   SilcServerCommandContext ctx;
 195   SilcServerCommand *cmd;
 196   SilcCommand command;
 197
 198   /* Allocate command context. This must be free'd by the
 199      command routine receiving it. */
 200   ctx = silc_server_command_alloc();
 201   ctx->server = server;
 202   ctx->sock = silc_socket_dup(sock);
 203   ctx->packet = silc_packet_context_dup(packet); /* Save original packet */
 204
 205   /* Parse the command payload in the packet */
 206   ctx->payload = silc_command_payload_parse(packet->buffer->data,
 207                                             packet->buffer->len);
 208   if (!ctx->payload) {
 209     SILC_LOG_ERROR(("Bad command payload, packet dropped"));
 210     silc_packet_context_free(packet);
 211     silc_socket_free(ctx->sock);
 212     silc_free(ctx);
 213     return;
 214   }
 215   ctx->args = silc_command_get_args(ctx->payload);
 216
 217   /* Get the command */
 218   command = silc_command_get(ctx->payload);
 219   for (cmd = silc_command_list; cmd->cb; cmd++)
 220     if (cmd->cmd == command)
 221       break;
 222
 223   if (!cmd || !cmd->cb) {
 224     SILC_LOG_DEBUG(("Unknown command %d", command));
 225     silc_server_command_send_status_reply(ctx, command,
 226                                           SILC_STATUS_ERR_UNKNOWN_COMMAND, 0);
 227     silc_server_command_free(ctx);
 228     return;
 229   }
 230
 231   /* Execute client's commands always with timeout.  Normally they are
 232      executed with zero (0) timeout but if client is sending command more
 233      frequently than once in 2 seconds, then the timeout may be 0 to 2
 234      seconds. */
 235   if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
 236     SilcClientEntry client = (SilcClientEntry)sock->user_data;
 237     SilcServerCommandTimeout timeout;
 238     int fast;
 239
 240     if (!client) {
 241       SILC_LOG_DEBUG(("Client entry is invalid"));
 242       silc_server_command_free(ctx);
 243       return;
 244     }
 245
 246     timeout = silc_calloc(1, sizeof(*timeout));
 247     timeout->ctx = ctx;
 248     timeout->cmd = cmd;
 249
 250     if (client->last_command && (time(NULL) - client->last_command) < 2) {
 251       client->fast_command++;
 252       fast = FALSE;
 253     } else {
 254       if (client->fast_command - 2 <= 0)
 255         client->fast_command = 0;
 256       else
 257         client->fast_command -= 2;
 258       fast = TRUE;
 259     }
 260
 261     if (!fast && ((cmd->flags & SILC_CF_LAG_STRICT) ||
 262                   (client->fast_command > 5 && cmd->flags & SILC_CF_LAG)))
 263       silc_schedule_task_add(server->schedule, sock->sock,
 264                              silc_server_command_process_timeout, timeout,
 265                              (client->fast_command < 3 ? 0 :
 266                               2 - (time(NULL) - client->last_command)),
 267                              (client->fast_command < 3 ? 200000 : 0),
 268                              SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
 269     else
 270       silc_schedule_task_add(server->schedule, sock->sock,
 271                              silc_server_command_process_timeout, timeout,
 272                              0, 1, SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
 273     return;
 274   }
 275
 276   /* Execute for server */
 277
 278   if (!(cmd->flags & SILC_CF_REG)) {
 279     SILC_LOG_DEBUG(("Calling %s command", silc_get_command_name(cmd->cmd)));
 280     cmd->cb(ctx, NULL);
 281   } else if (silc_server_is_registered(server, sock, ctx, cmd->cmd)) {
 282     SILC_LOG_DEBUG(("Calling %s command", silc_get_command_name(cmd->cmd)));
 283     cmd->cb(ctx, NULL);
 284   } else {
 285     SILC_LOG_DEBUG(("Server is not registered"));
 286     silc_server_command_free(ctx);
 287   }
 288 }
 289
 290 /* Allocate Command Context */
 291
 292 SilcServerCommandContext silc_server_command_alloc()
 293 {
 294   SilcServerCommandContext ctx = silc_calloc(1, sizeof(*ctx));
 295   ctx->users++;
 296   return ctx;
 297 }
 298
 299 /* Free's the command context allocated before executing the command */
 300
 301 void silc_server_command_free(SilcServerCommandContext ctx)
 302 {
 303   ctx->users--;
 304   SILC_LOG_DEBUG(("Command context %p refcnt %d->%d", ctx, ctx->users + 1,
 305                   ctx->users));
 306   if (ctx->users < 1) {
 307     if (ctx->payload)
 308       silc_command_payload_free(ctx->payload);
 309     if (ctx->packet)
 310       silc_packet_context_free(ctx->packet);
 311     if (ctx->sock)
 312       silc_socket_free(ctx->sock); /* Decrease reference counter */
 313     silc_free(ctx);
 314   }
 315 }
 316
 317 /* Duplicate Command Context by adding reference counter. The context won't
 318    be free'd untill it hits zero. */
 319
 320 SilcServerCommandContext
 321 silc_server_command_dup(SilcServerCommandContext ctx)
 322 {
 323   ctx->users++;
 324   SILC_LOG_DEBUG(("Command context %p refcnt %d->%d", ctx, ctx->users - 1,
 325                   ctx->users));
 326   return ctx;
 327 }
 328
 329 /* Timeout for pending command.  If reply to pending command never arrives
 330    this is called to free resources. */
 331
 332 SILC_TASK_CALLBACK(silc_server_command_pending_timeout)
 333 {
 334   SilcServer server = app_context;
 335   SilcServerCommandPending *reply = context;
 336   SilcServerCommandReplyContext cmdr;
 337   SilcBuffer tmpreply;
 338   int i;
 339
 340   SILC_LOG_DEBUG(("Timeout pending command"));
 341
 342   /* Allocate temporary and bogus command reply context */
 343   cmdr = silc_calloc(1, sizeof(*cmdr));
 344   cmdr->server = server;
 345   cmdr->ident = reply->ident;
 346
 347   /* Check for pending commands and mark to be exeucted */
 348   cmdr->callbacks =
 349     silc_server_command_pending_check(server, reply->reply_cmd,
 350                                       reply->ident, &cmdr->callbacks_count);
 351
 352   /* Create bogus command reply with an error inside */
 353   tmpreply =
 354     silc_command_reply_payload_encode_va(reply->reply_cmd ? reply->reply_cmd :
 355                                          SILC_COMMAND_RESERVED,
 356                                          SILC_STATUS_ERR_TIMEDOUT, 0,
 357                                          reply->ident, 0);
 358   cmdr->payload = silc_command_payload_parse(tmpreply->data, tmpreply->len);
 359   silc_buffer_free(tmpreply);
 360
 361   /* Call all callbacks. Same as SILC_SERVER_PENDING_EXEC macro. */
 362   for (i = 0; i < cmdr->callbacks_count; i++)
 363     if (cmdr->callbacks[i].callback)
 364       (*cmdr->callbacks[i].callback)(cmdr->callbacks[i].context, cmdr);
 365
 366   silc_server_command_pending_del(server, reply->reply_cmd, reply->ident);
 367   silc_server_command_reply_free(cmdr);
 368 }
 369
 370 /* Add new pending command to be executed when reply to a command has been
 371    received. The `reply_cmd' is the command that will call the `callback'
 372    with `context' when reply has been received.  It can be SILC_COMMAND_NONE
 373    to match any command with the `ident'.  If `ident' is non-zero
 374    the `callback' will be executed when received reply with command
 375    identifier `ident'. If there already exists pending command for the
 376    specified command, ident, callback and context this function has no
 377    effect. */
 378
 379 bool silc_server_command_pending(SilcServer server,
 380                                  SilcCommand reply_cmd,
 381                                  SilcUInt16 ident,
 382                                  SilcCommandCb callback,
 383                                  void *context)
 384 {
 385   return silc_server_command_pending_timed(server, reply_cmd, ident, callback,
 386                                            context, 0);
 387 }
 388
 389 /* Same as silc_server_command_pending with specific timeout for pending
 390    commands.  If the `timeout' is zero default timeout is used. */
 391
 392 bool silc_server_command_pending_timed(SilcServer server,
 393                                        SilcCommand reply_cmd,
 394                                        SilcUInt16 ident,
 395                                        SilcCommandCb callback,
 396                                        void *context,
 397                                        SilcUInt16 timeout)
 398 {
 399   SilcServerCommandPending *reply;
 400
 401   /* Check whether identical pending already exists for same command,
 402      ident, callback and callback context. If it does then it would be
 403      error to register it again. */
 404   silc_dlist_start(server->pending_commands);
 405   while ((reply = silc_dlist_get(server->pending_commands)) != SILC_LIST_END) {
 406     if (reply->reply_cmd == reply_cmd && reply->ident == ident &&
 407         reply->callback == callback && reply->context == context)
 408       return FALSE;
 409   }
 410
 411   reply = silc_calloc(1, sizeof(*reply));
 412   reply->reply_cmd = reply_cmd;
 413   reply->ident = ident;
 414   reply->context = context;
 415   reply->callback = callback;
 416   reply->timeout =
 417     silc_schedule_task_add(server->schedule, 0,
 418                            silc_server_command_pending_timeout, reply,
 419                            timeout ? timeout : 10, 0,
 420                            SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
 421   silc_dlist_add(server->pending_commands, reply);
 422
 423   return TRUE;
 424 }
 425
 426 /* Deletes pending command by reply command type. */
 427
 428 void silc_server_command_pending_del(SilcServer server,
 429                                      SilcCommand reply_cmd,
 430                                      SilcUInt16 ident)
 431 {
 432   SilcServerCommandPending *r;
 433
 434   silc_dlist_start(server->pending_commands);
 435   while ((r = silc_dlist_get(server->pending_commands)) != SILC_LIST_END) {
 436     if ((r->reply_cmd == reply_cmd || (r->reply_cmd == SILC_COMMAND_NONE &&
 437                                        r->reply_check))
 438         && r->ident == ident) {
 439       silc_dlist_del(server->pending_commands, r);
 440       if (r->timeout)
 441         silc_schedule_task_del(server->schedule, r->timeout);
 442       silc_free(r);
 443     }
 444   }
 445 }
 446
 447 /* Checks for pending commands and marks callbacks to be called from
 448    the command reply function. Returns TRUE if there were pending command. */
 449
 450 SilcServerCommandPendingCallbacks
 451 silc_server_command_pending_check(SilcServer server,
 452                                   SilcCommand command,
 453                                   SilcUInt16 ident,
 454                                   SilcUInt32 *callbacks_count)
 455 {
 456   SilcServerCommandPending *r;
 457   SilcServerCommandPendingCallbacks callbacks = NULL;
 458   int i = 0;
 459
 460   silc_dlist_start(server->pending_commands);
 461   while ((r = silc_dlist_get(server->pending_commands)) != SILC_LIST_END) {
 462     if ((r->reply_cmd == command || r->reply_cmd == SILC_COMMAND_NONE)
 463         && r->ident == ident) {
 464       callbacks = silc_realloc(callbacks, sizeof(*callbacks) * (i + 1));
 465       callbacks[i].context = r->context;
 466       callbacks[i].callback = r->callback;
 467       r->reply_check = TRUE;
 468       i++;
 469     }
 470   }
 471
 472   *callbacks_count = i;
 473   return callbacks;
 474 }
 475
 476 /* Sends simple status message as command reply packet */
 477
 478 static void
 479 silc_server_command_send_status_reply(SilcServerCommandContext cmd,
 480                                       SilcCommand command,
 481                                       SilcStatus status,
 482                                       SilcStatus error)
 483 {
 484   SilcBuffer buffer;
 485
 486   SILC_LOG_DEBUG(("Sending command status %d", status));
 487
 488   buffer =
 489     silc_command_reply_payload_encode_va(command, status, error,
 490                                          silc_command_get_ident(cmd->payload),
 491                                          0);
 492   silc_server_packet_send(cmd->server, cmd->sock,
 493                           SILC_PACKET_COMMAND_REPLY, 0,
 494                           buffer->data, buffer->len, FALSE);
 495   silc_buffer_free(buffer);
 496 }
 497
 498 /* Sends command status reply with one extra argument. The argument
 499    type must be sent as argument. */
 500
 501 static void
 502 silc_server_command_send_status_data(SilcServerCommandContext cmd,
 503                                      SilcCommand command,
 504                                      SilcStatus status,
 505                                      SilcStatus error,
 506                                      SilcUInt32 arg_type,
 507                                      const unsigned char *arg,
 508                                      SilcUInt32 arg_len)
 509 {
 510   SilcBuffer buffer;
 511
 512   SILC_LOG_DEBUG(("Sending command status %d", status));
 513
 514   buffer =
 515     silc_command_reply_payload_encode_va(command, status, 0,
 516                                          silc_command_get_ident(cmd->payload),
 517                                          1, arg_type, arg, arg_len);
 518   silc_server_packet_send(cmd->server, cmd->sock,
 519                           SILC_PACKET_COMMAND_REPLY, 0,
 520                           buffer->data, buffer->len, FALSE);
 521   silc_buffer_free(buffer);
 522 }
 523
 524 static void
 525 silc_server_command_send_status_data2(SilcServerCommandContext cmd,
 526                                       SilcCommand command,
 527                                       SilcStatus status,
 528                                       SilcStatus error,
 529                                       SilcUInt32 arg_type1,
 530                                       const unsigned char *arg1,
 531                                       SilcUInt32 arg_len1,
 532                                       SilcUInt32 arg_type2,
 533                                       const unsigned char *arg2,
 534                                       SilcUInt32 arg_len2)
 535 {
 536   SilcBuffer buffer;
 537
 538   SILC_LOG_DEBUG(("Sending command status %d", status));
 539
 540   buffer =
 541     silc_command_reply_payload_encode_va(command, status, 0,
 542                                          silc_command_get_ident(cmd->payload),
 543                                          2, arg_type1, arg1, arg_len1,
 544                                          arg_type2, arg2, arg_len2);
 545   silc_server_packet_send(cmd->server, cmd->sock,
 546                           SILC_PACKET_COMMAND_REPLY, 0,
 547                           buffer->data, buffer->len, FALSE);
 548   silc_buffer_free(buffer);
 549 }
 550
 551 /* This function can be called to check whether in the command reply
 552    an error occurred. This function has no effect if this is called
 553    when the command function was not called as pending command callback.
 554    This returns TRUE if error had occurred. */
 555
 556 static bool
 557 silc_server_command_pending_error_check(SilcServerCommandContext cmd,
 558                                         SilcServerCommandReplyContext cmdr,
 559                                         SilcCommand command)
 560 {
 561   if (!cmd->pending || !cmdr)
 562     return FALSE;
 563
 564   if (!silc_command_get_status(cmdr->payload, NULL, NULL)) {
 565     SilcBuffer buffer;
 566
 567     /* Send the same command reply payload */
 568     silc_command_set_command(cmdr->payload, silc_command_get(cmd->payload));
 569     silc_command_set_ident(cmdr->payload,
 570                            silc_command_get_ident(cmd->payload));
 571     buffer = silc_command_payload_encode_payload(cmdr->payload);
 572     silc_server_packet_send(cmd->server, cmd->sock,
 573                             SILC_PACKET_COMMAND_REPLY, 0,
 574                             buffer->data, buffer->len, FALSE);
 575     silc_buffer_free(buffer);
 576     return TRUE;
 577   }
 578
 579   return FALSE;
 580 }
 581
 582 /* Server side of command WHOIS. */
 583
 584 SILC_SERVER_CMD_FUNC(whois)
 585 {
 586   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
 587   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_WHOIS, cmd, 1, 256);
 588   silc_server_query_command(cmd->server, SILC_COMMAND_WHOIS, cmd);
 589   silc_server_command_free(cmd);
 590 }
 591
 592 /* Server side of command WHOWAS. */
 593
 594 SILC_SERVER_CMD_FUNC(whowas)
 595 {
 596   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
 597   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_WHOWAS, cmd, 1, 2);
 598   silc_server_query_command(cmd->server, SILC_COMMAND_WHOWAS, cmd);
 599   silc_server_command_free(cmd);
 600 }
 601
 602 /* Server side of command IDENTIFY. */
 603
 604 SILC_SERVER_CMD_FUNC(identify)
 605 {
 606   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
 607   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_IDENTIFY, cmd, 1, 256);
 608   silc_server_query_command(cmd->server, SILC_COMMAND_IDENTIFY, cmd);
 609   silc_server_command_free(cmd);
 610 }
 611
 612 /* Server side of command NICK. Sets nickname for user. Setting
 613    nickname causes generation of a new client ID for the client. The
 614    new client ID is sent to the client after changing the nickname. */
 615
 616 SILC_SERVER_CMD_FUNC(nick)
 617 {
 618   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
 619   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
 620   SilcServer server = cmd->server;
 621   SilcBuffer packet, nidp, oidp = NULL;
 622   SilcClientID *new_id;
 623   SilcUInt32 nick_len;
 624   char *nick;
 625   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
 626   int nickfail = 0;
 627
 628   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
 629     goto out;
 630
 631   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_NICK, cmd, 1, 1);
 632
 633   /* Check nickname */
 634   nick = silc_argument_get_arg_type(cmd->args, 1, &nick_len);
 635   if (!nick) {
 636     silc_server_command_send_status_reply(cmd, SILC_COMMAND_NICK,
 637                                           SILC_STATUS_ERR_BAD_NICKNAME, 0);
 638     goto out;
 639   }
 640   if (nick_len > 128)
 641     nick[128] = '\0';
 642   if (silc_server_name_bad_chars(nick, nick_len) == TRUE) {
 643     silc_server_command_send_status_reply(cmd, SILC_COMMAND_NICK,
 644                                           SILC_STATUS_ERR_BAD_NICKNAME, 0);
 645     goto out;
 646   }
 647
 648   /* Check for same nickname */
 649   if (!strcmp(client->nickname, nick)) {
 650     nidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
 651     goto send_reply;
 652   }
 653
 654   /* Create new Client ID */
 655   while (!silc_id_create_client_id(cmd->server, cmd->server->id,
 656                                    cmd->server->rng,
 657                                    cmd->server->md5hash, nick,
 658                                    &new_id)) {
 659     nickfail++;
 660     if (nickfail > 9) {
 661       silc_server_command_send_status_reply(cmd, SILC_COMMAND_NICK,
 662                                             SILC_STATUS_ERR_BAD_NICKNAME, 0);
 663       goto out;
 664     }
 665     snprintf(&nick[strlen(nick) - 1], 1, "%d", nickfail);
 666   }
 667
 668   /* Send notify about nickname change to our router. We send the new
 669      ID and ask to replace it with the old one. If we are router the
 670      packet is broadcasted. Send NICK_CHANGE notify. */
 671   silc_server_send_notify_nick_change(server, SILC_PRIMARY_ROUTE(server),
 672                                       SILC_BROADCAST(server), client->id,
 673                                       new_id, nick);
 674
 675   /* Check if anyone is watching the old nickname */
 676   if (server->server_type == SILC_ROUTER)
 677     silc_server_check_watcher_list(server, client, nick,
 678                                    SILC_NOTIFY_TYPE_NICK_CHANGE);
 679
 680   oidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
 681
 682   /* Remove old cache entry */
 683   silc_idcache_del_by_context(server->local_list->clients, client);
 684
 685   silc_free(client->id);
 686   client->id = new_id;
 687
 688   silc_free(client->nickname);
 689   client->nickname = strdup(nick);
 690
 691   /* Update client cache */
 692   silc_idcache_add(server->local_list->clients, client->nickname,
 693                    client->id, (void *)client, 0, NULL);
 694
 695   nidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
 696
 697   /* Send NICK_CHANGE notify to the client's channels */
 698   silc_server_send_notify_on_channels(server, NULL, client,
 699                                       SILC_NOTIFY_TYPE_NICK_CHANGE, 3,
 700                                       oidp->data, oidp->len,
 701                                       nidp->data, nidp->len,
 702                                       client->nickname,
 703                                       strlen(client->nickname));
 704
 705   /* Check if anyone is watching the new nickname */
 706   if (server->server_type == SILC_ROUTER)
 707     silc_server_check_watcher_list(server, client, NULL,
 708                                    SILC_NOTIFY_TYPE_NICK_CHANGE);
 709
 710  send_reply:
 711   /* Send the new Client ID as reply command back to client */
 712   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_NICK,
 713                                                 SILC_STATUS_OK, 0, ident, 2,
 714                                                 2, nidp->data, nidp->len,
 715                                                 3, nick, strlen(nick));
 716   silc_server_packet_send(cmd->server, cmd->sock, SILC_PACKET_COMMAND_REPLY,
 717                           0, packet->data, packet->len, FALSE);
 718
 719   silc_buffer_free(packet);
 720   silc_buffer_free(nidp);
 721   if (oidp)
 722     silc_buffer_free(oidp);
 723
 724  out:
 725   silc_server_command_free(cmd);
 726 }
 727
 728 /* Sends the LIST command reply */
 729
 730 static void
 731 silc_server_command_list_send_reply(SilcServerCommandContext cmd,
 732                                     SilcChannelEntry *lch,
 733                                     SilcUInt32 lch_count,
 734                                     SilcChannelEntry *gch,
 735                                     SilcUInt32 gch_count)
 736 {
 737   int i, k;
 738   SilcBuffer packet, idp;
 739   SilcChannelEntry entry;
 740   SilcStatus status;
 741   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
 742   char *topic;
 743   unsigned char usercount[4];
 744   SilcUInt32 users;
 745   int valid_lcount = 0, valid_rcount = 0;
 746
 747   for (i = 0; i < lch_count; i++) {
 748     if (lch[i]->mode & SILC_CHANNEL_MODE_SECRET)
 749       lch[i] = NULL;
 750     else
 751       valid_lcount++;
 752   }
 753   for (i = 0; i < gch_count; i++) {
 754     if (gch[i]->mode & SILC_CHANNEL_MODE_SECRET)
 755       gch[i] = NULL;
 756     else
 757       valid_rcount++;
 758   }
 759
 760   status = SILC_STATUS_OK;
 761   if ((lch_count + gch_count) > 1)
 762     status = SILC_STATUS_LIST_START;
 763
 764   /* Local list */
 765   for (i = 0, k = 0; i < lch_count; i++) {
 766     entry = lch[i];
 767     if (!entry)
 768       continue;
 769
 770     if (k >= 1)
 771       status = SILC_STATUS_LIST_ITEM;
 772     if (valid_lcount > 1 && k == valid_lcount - 1 && !valid_rcount)
 773       status = SILC_STATUS_LIST_END;
 774
 775     idp = silc_id_payload_encode(entry->id, SILC_ID_CHANNEL);
 776
 777     if (entry->mode & SILC_CHANNEL_MODE_PRIVATE) {
 778       topic = "*private*";
 779       memset(usercount, 0, sizeof(usercount));
 780     } else {
 781       topic = entry->topic;
 782       users = silc_hash_table_count(entry->user_list);
 783       SILC_PUT32_MSB(users, usercount);
 784     }
 785
 786     /* Send the reply */
 787     packet =
 788       silc_command_reply_payload_encode_va(SILC_COMMAND_LIST,
 789                                            status, 0, ident, 4,
 790                                            2, idp->data, idp->len,
 791                                            3, entry->channel_name,
 792                                            strlen(entry->channel_name),
 793                                            4, topic, topic ? strlen(topic) : 0,
 794                                            5, usercount, 4);
 795     silc_server_packet_send(cmd->server, cmd->sock,
 796                             SILC_PACKET_COMMAND_REPLY, 0, packet->data,
 797                             packet->len, FALSE);
 798     silc_buffer_free(packet);
 799     silc_buffer_free(idp);
 800     k++;
 801   }
 802
 803   /* Global list */
 804   for (i = 0, k = 0; i < gch_count; i++) {
 805     entry = gch[i];
 806     if (!entry)
 807       continue;
 808
 809     if (k >= 1)
 810       status = SILC_STATUS_LIST_ITEM;
 811     if (valid_rcount > 1 && k == valid_rcount - 1)
 812       status = SILC_STATUS_LIST_END;
 813
 814     idp = silc_id_payload_encode(entry->id, SILC_ID_CHANNEL);
 815
 816     if (entry->mode & SILC_CHANNEL_MODE_PRIVATE) {
 817       topic = "*private*";
 818       memset(usercount, 0, sizeof(usercount));
 819     } else {
 820       topic = entry->topic;
 821       users = entry->user_count;
 822       SILC_PUT32_MSB(users, usercount);
 823     }
 824
 825     /* Send the reply */
 826     packet =
 827       silc_command_reply_payload_encode_va(SILC_COMMAND_LIST,
 828                                            status, 0, ident, 4,
 829                                            2, idp->data, idp->len,
 830                                            3, entry->channel_name,
 831                                            strlen(entry->channel_name),
 832                                            4, topic, topic ? strlen(topic) : 0,
 833                                            5, usercount, 4);
 834     silc_server_packet_send(cmd->server, cmd->sock,
 835                             SILC_PACKET_COMMAND_REPLY, 0, packet->data,
 836                             packet->len, FALSE);
 837     silc_buffer_free(packet);
 838     silc_buffer_free(idp);
 839     k++;
 840   }
 841 }
 842
 843 /* Server side of LIST command. This lists the channel of the requested
 844    server. Secret channels are not listed. */
 845
 846 SILC_SERVER_CMD_FUNC(list)
 847 {
 848   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
 849   SilcServer server = cmd->server;
 850   SilcChannelID *channel_id = NULL;
 851   unsigned char *tmp;
 852   SilcUInt32 tmp_len;
 853   SilcChannelEntry *lchannels = NULL, *gchannels = NULL;
 854   SilcUInt32 lch_count = 0, gch_count = 0;
 855
 856   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_LIST, cmd, 0, 1);
 857
 858   /* If we are normal server, send the command to router, since we
 859      want to know all channels in the network. */
 860   if (!cmd->pending && server->server_type != SILC_ROUTER &&
 861       !server->standalone) {
 862     SilcBuffer tmpbuf;
 863     SilcUInt16 old_ident;
 864
 865     old_ident = silc_command_get_ident(cmd->payload);
 866     silc_command_set_ident(cmd->payload, ++server->cmd_ident);
 867     tmpbuf = silc_command_payload_encode_payload(cmd->payload);
 868     silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
 869                             SILC_PACKET_COMMAND, cmd->packet->flags,
 870                             tmpbuf->data, tmpbuf->len, TRUE);
 871
 872     /* Reprocess this packet after received reply from router */
 873     silc_server_command_pending(server, SILC_COMMAND_LIST,
 874                                 silc_command_get_ident(cmd->payload),
 875                                 silc_server_command_list,
 876                                 silc_server_command_dup(cmd));
 877     cmd->pending = TRUE;
 878     silc_command_set_ident(cmd->payload, old_ident);
 879     silc_buffer_free(tmpbuf);
 880     goto out;
 881   }
 882
 883   /* Get Channel ID */
 884   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
 885   if (tmp) {
 886     channel_id = silc_id_payload_parse_id(tmp, tmp_len, NULL);
 887     if (!channel_id) {
 888       silc_server_command_send_status_reply(cmd, SILC_COMMAND_LIST,
 889                                             SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
 890       goto out;
 891     }
 892   }
 893
 894   /* Get the channels from local list */
 895   lchannels = silc_idlist_get_channels(server->local_list, channel_id,
 896                                        &lch_count);
 897
 898   /* Get the channels from global list */
 899   gchannels = silc_idlist_get_channels(server->global_list, channel_id,
 900                                        &gch_count);
 901
 902   /* Send the reply */
 903   silc_server_command_list_send_reply(cmd, lchannels, lch_count,
 904                                       gchannels, gch_count);
 905
 906   silc_free(lchannels);
 907   silc_free(gchannels);
 908
 909  out:
 910   silc_server_command_free(cmd);
 911 }
 912
 913 /* Server side of TOPIC command. Sets topic for channel and/or returns
 914    current topic to client. */
 915
 916 SILC_SERVER_CMD_FUNC(topic)
 917 {
 918   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
 919   SilcServer server = cmd->server;
 920   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
 921   SilcChannelID *channel_id;
 922   SilcChannelEntry channel;
 923   SilcChannelClientEntry chl;
 924   SilcBuffer packet, idp;
 925   unsigned char *tmp;
 926   SilcUInt32 argc, tmp_len;
 927   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
 928
 929   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
 930     goto out;
 931
 932   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_TOPIC, cmd, 1, 2);
 933
 934   argc = silc_argument_get_arg_num(cmd->args);
 935
 936   /* Get Channel ID */
 937   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
 938   if (!tmp) {
 939     silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
 940                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
 941     goto out;
 942   }
 943   channel_id = silc_id_payload_parse_id(tmp, tmp_len, NULL);
 944   if (!channel_id) {
 945     silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
 946                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
 947     goto out;
 948   }
 949
 950   /* Check whether the channel exists */
 951   channel = silc_idlist_find_channel_by_id(server->local_list,
 952                                            channel_id, NULL);
 953   if (!channel) {
 954     channel = silc_idlist_find_channel_by_id(server->global_list,
 955                                              channel_id, NULL);
 956     if (!channel) {
 957       silc_server_command_send_status_data(cmd, SILC_COMMAND_TOPIC,
 958                                            SILC_STATUS_ERR_NO_SUCH_CHANNEL_ID,
 959                                            0, 2, tmp, tmp_len);
 960       goto out;
 961     }
 962   }
 963
 964   if (argc > 1) {
 965     /* Get the topic */
 966     tmp = silc_argument_get_arg_type(cmd->args, 2, NULL);
 967     if (!tmp) {
 968       silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
 969                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
 970                                             0);
 971       goto out;
 972     }
 973
 974     if (strlen(tmp) > 256) {
 975       silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
 976                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
 977                                             0);
 978       goto out;
 979     }
 980
 981     /* See whether the client is on channel and has rights to change topic */
 982     if (!silc_server_client_on_channel(client, channel, &chl)) {
 983       tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
 984       silc_server_command_send_status_data(cmd, SILC_COMMAND_TOPIC,
 985                                            SILC_STATUS_ERR_NOT_ON_CHANNEL,
 986                                            0, 2, tmp, tmp_len);
 987       goto out;
 988     }
 989
 990     if (channel->mode & SILC_CHANNEL_MODE_TOPIC &&
 991         !(chl->mode & SILC_CHANNEL_UMODE_CHANOP) &&
 992         !(chl->mode & SILC_CHANNEL_UMODE_CHANFO)) {
 993       tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
 994       silc_server_command_send_status_data(cmd, SILC_COMMAND_TOPIC,
 995                                            SILC_STATUS_ERR_NO_CHANNEL_PRIV,
 996                                            0, 2, tmp, tmp_len);
 997       goto out;
 998     }
 999
1000     if (!channel->topic || strcmp(channel->topic, tmp)) {
1001       /* Set the topic for channel */
1002       silc_free(channel->topic);
1003       channel->topic = strdup(tmp);
1004
1005       /* Send TOPIC_SET notify type to the network */
1006       silc_server_send_notify_topic_set(server, SILC_PRIMARY_ROUTE(server),
1007                                         SILC_BROADCAST(server), channel,
1008                                         client->id, SILC_ID_CLIENT,
1009                                         channel->topic);
1010
1011       /* Send notify about topic change to all clients on the channel */
1012       idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
1013       silc_server_send_notify_to_channel(server, NULL, channel, FALSE, TRUE,
1014                                          SILC_NOTIFY_TYPE_TOPIC_SET, 2,
1015                                          idp->data, idp->len,
1016                                          channel->topic,
1017                                          strlen(channel->topic));
1018       silc_buffer_free(idp);
1019     }
1020   }
1021
1022   /* Send the topic to client as reply packet */
1023   idp = silc_id_payload_encode(channel_id, SILC_ID_CHANNEL);
1024   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_TOPIC,
1025                                                 SILC_STATUS_OK, 0, ident, 2,
1026                                                 2, idp->data, idp->len,
1027                                                 3, channel->topic,
1028                                                 channel->topic ?
1029                                                 strlen(channel->topic) : 0);
1030   silc_server_packet_send(cmd->server, cmd->sock, SILC_PACKET_COMMAND_REPLY,
1031                           0, packet->data, packet->len, FALSE);
1032
1033   silc_buffer_free(packet);
1034   silc_buffer_free(idp);
1035   silc_free(channel_id);
1036
1037  out:
1038   silc_server_command_free(cmd);
1039 }
1040
1041 /* Server side of INVITE command. Invites some client to join some channel.
1042    This command is also used to manage the invite list of the channel. */
1043
1044 SILC_SERVER_CMD_FUNC(invite)
1045 {
1046   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
1047   SilcServer server = cmd->server;
1048   SilcSocketConnection sock = cmd->sock, dest_sock;
1049   SilcChannelClientEntry chl;
1050   SilcClientEntry sender, dest;
1051   SilcClientID *dest_id = NULL;
1052   SilcChannelEntry channel;
1053   SilcChannelID *channel_id = NULL;
1054   SilcIDListData idata;
1055   SilcArgumentPayload args;
1056   SilcHashTableList htl;
1057   SilcBuffer packet, list, tmp2;
1058   SilcBufferStruct alist;
1059   unsigned char *tmp, *atype = NULL;
1060   SilcUInt32 len, type, len2;
1061   SilcUInt16 argc = 0, ident = silc_command_get_ident(cmd->payload);
1062
1063   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_INVITE, cmd, 1, 4);
1064
1065   /* Get Channel ID */
1066   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
1067   if (!tmp) {
1068     silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
1069                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
1070     goto out;
1071   }
1072   channel_id = silc_id_payload_parse_id(tmp, len, NULL);
1073   if (!channel_id) {
1074     silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
1075                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
1076     goto out;
1077   }
1078
1079   /* Get the channel entry */
1080   channel = silc_idlist_find_channel_by_id(server->local_list,
1081                                            channel_id, NULL);
1082   if (!channel) {
1083     channel = silc_idlist_find_channel_by_id(server->global_list,
1084                                              channel_id, NULL);
1085     if (!channel) {
1086       silc_server_command_send_status_data(cmd, SILC_COMMAND_INVITE,
1087                                            SILC_STATUS_ERR_NO_SUCH_CHANNEL_ID,
1088                                            0, 2, tmp, len);
1089       goto out;
1090     }
1091   }
1092
1093   /* Check whether the sender of this command is on the channel. */
1094   sender = (SilcClientEntry)sock->user_data;
1095   if (!sender || !silc_server_client_on_channel(sender, channel, &chl)) {
1096     silc_server_command_send_status_data(cmd, SILC_COMMAND_INVITE,
1097                                          SILC_STATUS_ERR_NOT_ON_CHANNEL, 0,
1098                                          2, tmp, len);
1099     goto out;
1100   }
1101
1102   /* Check whether the channel is invite-only channel. If yes then the
1103      sender of this command must be at least channel operator. */
1104   if (channel->mode & SILC_CHANNEL_MODE_INVITE &&
1105       !(chl->mode & SILC_CHANNEL_UMODE_CHANOP) &&
1106       !(chl->mode & SILC_CHANNEL_UMODE_CHANFO)) {
1107     silc_server_command_send_status_data(cmd, SILC_COMMAND_INVITE,
1108                                          SILC_STATUS_ERR_NO_CHANNEL_PRIV,
1109                                          0, 2, tmp, len);
1110     goto out;
1111   }
1112
1113   /* Get destination client ID */
1114   tmp = silc_argument_get_arg_type(cmd->args, 2, &len);
1115   if (tmp) {
1116     bool resolve;
1117
1118     dest_id = silc_id_payload_parse_id(tmp, len, NULL);
1119     if (!dest_id) {
1120       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
1121                                             SILC_STATUS_ERR_NO_CLIENT_ID, 0);
1122       goto out;
1123     }
1124
1125     /* Get the client entry */
1126     dest = silc_server_query_client(server, dest_id, FALSE, &resolve);
1127     if (!dest) {
1128       if (server->server_type != SILC_SERVER || !resolve || cmd->pending) {
1129         silc_server_command_send_status_data(
1130                                         cmd, SILC_COMMAND_INVITE,
1131                                         SILC_STATUS_ERR_NO_SUCH_CLIENT_ID, 0,
1132                                         2, tmp, len);
1133         goto out;
1134       }
1135
1136       /* The client info is being resolved. Reprocess this packet after
1137          receiving the reply to the query. */
1138       silc_server_command_pending(server, SILC_COMMAND_WHOIS,
1139                                   server->cmd_ident,
1140                                   silc_server_command_invite,
1141                                   silc_server_command_dup(cmd));
1142       cmd->pending = TRUE;
1143       goto out;
1144     }
1145
1146     /* Check whether the requested client is already on the channel. */
1147     if (silc_server_client_on_channel(dest, channel, NULL)) {
1148       atype = silc_argument_get_arg_type(cmd->args, 1, &len2);
1149       silc_server_command_send_status_data2(cmd, SILC_COMMAND_INVITE,
1150                                             SILC_STATUS_ERR_USER_ON_CHANNEL,
1151                                             0, 2, tmp, len,
1152                                             3, atype, len2);
1153       goto out;
1154     }
1155
1156     /* Get route to the client */
1157     dest_sock = silc_server_get_client_route(server, NULL, 0, dest_id,
1158                                              &idata, NULL);
1159     if (!dest_sock) {
1160       silc_server_command_send_status_data(cmd, SILC_COMMAND_INVITE,
1161                                            SILC_STATUS_ERR_NO_SUCH_CLIENT_ID,
1162                                            0, 2, tmp, len);
1163       goto out;
1164     }
1165
1166     /* Add the client to the invite list */
1167
1168     /* Allocate hash table for invite list if it doesn't exist yet */
1169     if (!channel->invite_list)
1170       channel->invite_list =
1171         silc_hash_table_alloc(0, silc_hash_ptr,
1172                               NULL, NULL, NULL,
1173                               silc_server_inviteban_destruct, channel, TRUE);
1174
1175     /* Check if the ID is in the list already */
1176     silc_hash_table_list(channel->invite_list, &htl);
1177     while (silc_hash_table_get(&htl, (void *)&type, (void *)&tmp2)) {
1178       if (type == 3 && !memcmp(tmp2->data, tmp, len)) {
1179         tmp = NULL;
1180         break;
1181       }
1182     }
1183     silc_hash_table_list_reset(&htl);
1184
1185     /* Add new Client ID to invite list */
1186     if (tmp) {
1187       list = silc_buffer_alloc_size(len);
1188       silc_buffer_put(list, tmp, len);
1189       silc_hash_table_add(channel->invite_list, (void *)3, list);
1190     }
1191
1192     if (!(dest->mode & SILC_UMODE_BLOCK_INVITE)) {
1193       /* Send notify to the client that is invited to the channel */
1194       SilcBuffer idp, idp2;
1195       idp = silc_id_payload_encode(channel_id, SILC_ID_CHANNEL);
1196       idp2 = silc_id_payload_encode(sender->id, SILC_ID_CLIENT);
1197       silc_server_send_notify_dest(server, dest_sock, FALSE, dest_id,
1198                                    SILC_ID_CLIENT,
1199                                    SILC_NOTIFY_TYPE_INVITE, 3,
1200                                    idp->data, idp->len,
1201                                    channel->channel_name,
1202                                    strlen(channel->channel_name),
1203                                    idp2->data, idp2->len);
1204       silc_buffer_free(idp);
1205       silc_buffer_free(idp2);
1206     }
1207   }
1208
1209   /* Get the invite information */
1210   tmp = silc_argument_get_arg_type(cmd->args, 4, &len2);
1211   if (tmp && len2 > 2) {
1212     /* Parse the arguments to see they are constructed correctly */
1213     SILC_GET16_MSB(argc, tmp);
1214     args = silc_argument_payload_parse(tmp + 2, len2 - 2, argc);
1215     if (!args) {
1216       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
1217                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
1218                                             0);
1219       goto out;
1220     }
1221
1222     /* Get the type of action */
1223     atype = silc_argument_get_arg_type(cmd->args, 3, &len);
1224     if (atype && len == 1) {
1225       if (atype[0] == 0x00) {
1226         /* Allocate hash table for invite list if it doesn't exist yet */
1227         if (!channel->invite_list)
1228           channel->invite_list =
1229             silc_hash_table_alloc(0, silc_hash_ptr,
1230                                   NULL, NULL, NULL,
1231                                   silc_server_inviteban_destruct, channel,
1232                                   TRUE);
1233
1234         /* Check for resource limit */
1235         if (silc_hash_table_count(channel->invite_list) > 64) {
1236           silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
1237                                                 SILC_STATUS_ERR_RESOURCE_LIMIT,
1238                                                 0);
1239           goto out;
1240         }
1241       }
1242
1243       /* Now add or delete the information. */
1244       silc_server_inviteban_process(server, channel->invite_list,
1245                                     (SilcUInt8)atype[0], args);
1246     }
1247     silc_argument_payload_free(args);
1248   }
1249
1250   /* Encode invite list */
1251   list = NULL;
1252   if (channel->invite_list && silc_hash_table_count(channel->invite_list)) {
1253     list = silc_buffer_alloc_size(2);
1254     silc_buffer_format(list,
1255                        SILC_STR_UI_SHORT(silc_hash_table_count(
1256                                           channel->invite_list)),
1257                        SILC_STR_END);
1258     silc_hash_table_list(channel->invite_list, &htl);
1259     while (silc_hash_table_get(&htl, (void *)&type, (void *)&tmp2))
1260       list = silc_argument_payload_encode_one(list, tmp2->data, tmp2->len,
1261                                               type);
1262     silc_hash_table_list_reset(&htl);
1263   }
1264
1265   /* The notify is sent to local servers (not clients), and to network. */
1266   if (atype && tmp && len2) {
1267     silc_buffer_set(&alist, tmp, len2);
1268
1269     /* Send to local servers if we are router */
1270     if (server->server_type == SILC_ROUTER) {
1271       SilcBuffer idp, idp2;
1272       idp = silc_id_payload_encode(channel_id, SILC_ID_CHANNEL);
1273       idp2 = silc_id_payload_encode(sender->id, SILC_ID_CLIENT);
1274       silc_server_send_notify_to_channel(server, NULL, channel, FALSE, FALSE,
1275                                          SILC_NOTIFY_TYPE_INVITE, 5,
1276                                          idp->data, idp->len,
1277                                          channel->channel_name,
1278                                          strlen(channel->channel_name),
1279                                          idp2->data, idp2->len,
1280                                          atype, 1,
1281                                          tmp ? alist.data : NULL,
1282                                          tmp ? alist.len : 0);
1283       silc_buffer_free(idp);
1284       silc_buffer_free(idp2);
1285     }
1286
1287     /* Send to network */
1288     silc_server_send_notify_invite(server, SILC_PRIMARY_ROUTE(server),
1289                                    SILC_BROADCAST(server), channel,
1290                                    sender->id, atype,
1291                                    tmp ? &alist : NULL);
1292   }
1293
1294   /* Send invite list back only if the list was modified, or no arguments
1295      was given. */
1296   type = 0;
1297   argc = silc_argument_get_arg_num(cmd->args);
1298   if (argc == 1)
1299     type = 1;
1300   if (silc_argument_get_arg_type(cmd->args, 3, &len))
1301     type = 1;
1302
1303   /* Send command reply */
1304   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
1305   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_INVITE,
1306                                                 SILC_STATUS_OK, 0, ident, 2,
1307                                                 2, tmp, len,
1308                                                 3, type && list ?
1309                                                 list->data : NULL,
1310                                                 type && list ? list->len : 0);
1311   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
1312                           packet->data, packet->len, FALSE);
1313   silc_buffer_free(packet);
1314   silc_buffer_free(list);
1315
1316  out:
1317   silc_free(dest_id);
1318   silc_free(channel_id);
1319   silc_server_command_free(cmd);
1320 }
1321
1322 typedef struct {
1323   SilcSocketConnection sock;
1324   char *signoff;
1325 } *QuitInternal;
1326
1327 /* Quits connection to client. This gets called if client won't
1328    close the connection even when it has issued QUIT command. */
1329
1330 SILC_TASK_CALLBACK(silc_server_command_quit_cb)
1331 {
1332   SilcServer server = app_context;
1333   QuitInternal q = (QuitInternal)context;
1334
1335   if (q->sock->user_data) {
1336     /* Free all client specific data, such as client entry and entires
1337        on channels this client may be on. */
1338     silc_server_free_client_data(server, q->sock, q->sock->user_data,
1339                                  TRUE, q->signoff);
1340     q->sock->user_data = NULL;
1341   }
1342
1343   if (!SILC_IS_DISCONNECTED(q->sock))
1344     /* Close the connection on our side */
1345     silc_server_close_connection(server, q->sock);
1346
1347   silc_socket_free(q->sock);
1348   silc_free(q->signoff);
1349   silc_free(q);
1350 }
1351
1352 /* Quits SILC session. This is the normal way to disconnect client. */
1353
1354 SILC_SERVER_CMD_FUNC(quit)
1355 {
1356   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
1357   SilcServer server = cmd->server;
1358   SilcSocketConnection sock = cmd->sock;
1359   QuitInternal q;
1360   unsigned char *tmp = NULL;
1361   SilcUInt32 len = 0;
1362
1363   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_QUIT, cmd, 0, 1);
1364
1365   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
1366     goto out;
1367
1368   /* Get message */
1369   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
1370   if (len > 128)
1371     tmp = NULL;
1372
1373   q = silc_calloc(1, sizeof(*q));
1374   q->sock = silc_socket_dup(sock);
1375   q->signoff = tmp ? strdup(tmp) : NULL;
1376
1377   /* We quit the connection with little timeout */
1378   silc_schedule_task_add(server->schedule, sock->sock,
1379                          silc_server_command_quit_cb, (void *)q,
1380                          0, 200000, SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
1381
1382  out:
1383   silc_server_command_free(cmd);
1384 }
1385
1386 /* Server side of command KILL. This command is used by router operator
1387    to remove an client from the SILC Network temporarily. */
1388
1389 SILC_SERVER_CMD_FUNC(kill)
1390 {
1391   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
1392   SilcServer server = cmd->server;
1393   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
1394   SilcClientEntry remote_client;
1395   SilcClientID *client_id = NULL;
1396   unsigned char *tmp, *comment, *auth;
1397   SilcUInt32 tmp_len, tmp_len2, auth_len;
1398
1399   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_KILL, cmd, 1, 3);
1400
1401   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
1402     goto out;
1403
1404   /* Get authentication payload if present */
1405   auth = silc_argument_get_arg_type(cmd->args, 3, &auth_len);
1406
1407   if (!auth) {
1408     /* Router operator killing */
1409
1410     /* KILL command works only on router */
1411     if (server->server_type != SILC_ROUTER) {
1412       silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
1413                                             SILC_STATUS_ERR_NO_ROUTER_PRIV, 0);
1414       goto out;
1415     }
1416
1417     /* Check whether client has the permissions. */
1418     if (!(client->mode & SILC_UMODE_ROUTER_OPERATOR)) {
1419       silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
1420                                             SILC_STATUS_ERR_NO_ROUTER_PRIV, 0);
1421       goto out;
1422     }
1423   }
1424
1425   /* Get the client ID */
1426   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
1427   if (!tmp) {
1428     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
1429                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
1430                                           0);
1431     goto out;
1432   }
1433   client_id = silc_id_payload_parse_id(tmp, tmp_len, NULL);
1434   if (!client_id) {
1435     silc_server_command_send_status_data(cmd, SILC_COMMAND_KILL,
1436                                          SILC_STATUS_ERR_NO_SUCH_CLIENT_ID,
1437                                          0, 2, tmp, tmp_len);
1438     goto out;
1439   }
1440
1441   /* Get the client entry */
1442   remote_client = silc_idlist_find_client_by_id(server->local_list,
1443                                                 client_id, TRUE, NULL);
1444   if (!remote_client) {
1445     remote_client = silc_idlist_find_client_by_id(server->global_list,
1446                                                   client_id, TRUE, NULL);
1447     if (!remote_client) {
1448       silc_server_command_send_status_data(cmd, SILC_COMMAND_KILL,
1449                                            SILC_STATUS_ERR_NO_SUCH_CLIENT_ID,
1450                                            0, 2, tmp, tmp_len);
1451       goto out;
1452     }
1453   }
1454
1455   /* Get comment */
1456   comment = silc_argument_get_arg_type(cmd->args, 2, &tmp_len2);
1457   if (comment && tmp_len2 > 128) {
1458     tmp_len2 = 128;
1459     comment[127] = '\0';
1460   }
1461
1462   /* If authentication data is provided then verify that killing is
1463      actually allowed */
1464   if (auth && auth_len) {
1465     SilcSocketConnection sock;
1466
1467     if (!SILC_IS_LOCAL(remote_client) || !remote_client->data.public_key) {
1468       silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
1469                                             SILC_STATUS_ERR_OPERATION_ALLOWED,
1470                                             0);
1471       goto out;
1472     }
1473
1474     /* Verify the signature */
1475     if (!silc_auth_verify_data(auth, auth_len, SILC_AUTH_PUBLIC_KEY,
1476                                remote_client->data.public_key, 0,
1477                                server->sha1hash, remote_client->id,
1478                                SILC_ID_CLIENT)) {
1479       silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
1480                                             SILC_STATUS_ERR_AUTH_FAILED, 0);
1481       goto out;
1482     }
1483
1484     /* Send reply to the sender */
1485     silc_server_command_send_status_data(cmd, SILC_COMMAND_KILL,
1486                                          SILC_STATUS_OK, 0,
1487                                          2, tmp, tmp_len);
1488
1489     /* Do normal signoff for the destination client */
1490     sock = remote_client->connection;
1491     silc_server_remove_from_channels(server, NULL, remote_client,
1492                                      TRUE, (char *)"Killed", TRUE, TRUE);
1493     silc_server_free_client_data(server, NULL, remote_client, TRUE,
1494                                  comment ? comment :
1495                                  (unsigned char *)"Killed");
1496     if (sock)
1497       silc_server_close_connection(server, sock);
1498   } else {
1499     /* Router operator killing */
1500
1501     /* Send reply to the sender */
1502     silc_server_command_send_status_data(cmd, SILC_COMMAND_KILL,
1503                                          SILC_STATUS_OK, 0,
1504                                          2, tmp, tmp_len);
1505
1506     /* Check if anyone is watching this nickname */
1507     if (server->server_type == SILC_ROUTER)
1508       silc_server_check_watcher_list(server, client, NULL,
1509                                      SILC_NOTIFY_TYPE_KILLED);
1510
1511     /* Now do the killing */
1512     silc_server_kill_client(server, remote_client, comment, client->id,
1513                             SILC_ID_CLIENT);
1514   }
1515
1516  out:
1517   silc_free(client_id);
1518   silc_server_command_free(cmd);
1519 }
1520
1521 /* Server side of command INFO. This sends information about us to
1522    the client. If client requested specific server we will send the
1523    command to that server. */
1524
1525 SILC_SERVER_CMD_FUNC(info)
1526 {
1527   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
1528   SilcServer server = cmd->server;
1529   SilcBuffer packet, idp;
1530   unsigned char *tmp;
1531   SilcUInt32 tmp_len;
1532   char *dest_server, *server_info = NULL, *server_name;
1533   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
1534   SilcServerEntry entry = NULL;
1535   SilcServerID *server_id = NULL;
1536
1537   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_INFO, cmd, 0, 2);
1538
1539   /* Get server name */
1540   dest_server = silc_argument_get_arg_type(cmd->args, 1, NULL);
1541
1542   /* Get Server ID */
1543   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
1544   if (tmp) {
1545     server_id = silc_id_payload_parse_id(tmp, tmp_len, NULL);
1546     if (!server_id) {
1547       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
1548                                             SILC_STATUS_ERR_NO_SERVER_ID, 0);
1549       goto out;
1550     }
1551   }
1552
1553   if (server_id) {
1554     /* Check whether we have this server cached */
1555     entry = silc_idlist_find_server_by_id(server->local_list,
1556                                           server_id, TRUE, NULL);
1557     if (!entry) {
1558       entry = silc_idlist_find_server_by_id(server->global_list,
1559                                             server_id, TRUE, NULL);
1560       if (!entry && server->server_type != SILC_SERVER) {
1561         silc_server_command_send_status_data(cmd, SILC_COMMAND_INFO,
1562                                              SILC_STATUS_ERR_NO_SUCH_SERVER_ID,
1563                                              0, 2, tmp, tmp_len);
1564         goto out;
1565       }
1566     }
1567   }
1568
1569   /* Some buggy servers has sent request to router about themselves. */
1570   if (server->server_type != SILC_SERVER && cmd->sock->user_data == entry)
1571     goto out;
1572
1573   if ((!dest_server && !server_id && !entry) || (entry &&
1574                                                  entry == server->id_entry) ||
1575       (dest_server && !cmd->pending &&
1576        !strncasecmp(dest_server, server->server_name, strlen(dest_server)))) {
1577     /* Send our reply */
1578     char info_string[256];
1579
1580     memset(info_string, 0, sizeof(info_string));
1581     snprintf(info_string, sizeof(info_string),
1582              "location: %s server: %s admin: %s <%s>",
1583              server->config->server_info->location,
1584              server->config->server_info->server_type,
1585              server->config->server_info->admin,
1586              server->config->server_info->email);
1587
1588     server_info = info_string;
1589     entry = server->id_entry;
1590   } else {
1591     /* Check whether we have this server cached */
1592     if (!entry && dest_server) {
1593       entry = silc_idlist_find_server_by_name(server->global_list,
1594                                               dest_server, TRUE, NULL);
1595       if (!entry) {
1596         entry = silc_idlist_find_server_by_name(server->local_list,
1597                                                 dest_server, TRUE, NULL);
1598       }
1599     }
1600
1601     if (!cmd->pending &&
1602         server->server_type != SILC_SERVER && entry && !entry->server_info) {
1603       /* Send to the server */
1604       SilcBuffer tmpbuf;
1605       SilcUInt16 old_ident;
1606
1607       old_ident = silc_command_get_ident(cmd->payload);
1608       silc_command_set_ident(cmd->payload, ++server->cmd_ident);
1609       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
1610
1611       silc_server_packet_send(server, entry->connection,
1612                               SILC_PACKET_COMMAND, cmd->packet->flags,
1613                               tmpbuf->data, tmpbuf->len, TRUE);
1614
1615       /* Reprocess this packet after received reply from router */
1616       silc_server_command_pending(server, SILC_COMMAND_INFO,
1617                                   silc_command_get_ident(cmd->payload),
1618                                   silc_server_command_info,
1619                                   silc_server_command_dup(cmd));
1620       cmd->pending = TRUE;
1621       silc_command_set_ident(cmd->payload, old_ident);
1622       silc_buffer_free(tmpbuf);
1623       goto out;
1624     }
1625
1626     if (!entry && !cmd->pending && !server->standalone) {
1627       /* Send to the primary router */
1628       SilcBuffer tmpbuf;
1629       SilcUInt16 old_ident;
1630
1631       old_ident = silc_command_get_ident(cmd->payload);
1632       silc_command_set_ident(cmd->payload, ++server->cmd_ident);
1633       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
1634
1635       silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
1636                               SILC_PACKET_COMMAND, cmd->packet->flags,
1637                               tmpbuf->data, tmpbuf->len, TRUE);
1638
1639       /* Reprocess this packet after received reply from router */
1640       silc_server_command_pending(server, SILC_COMMAND_INFO,
1641                                   silc_command_get_ident(cmd->payload),
1642                                   silc_server_command_info,
1643                                   silc_server_command_dup(cmd));
1644       cmd->pending = TRUE;
1645       silc_command_set_ident(cmd->payload, old_ident);
1646       silc_buffer_free(tmpbuf);
1647       goto out;
1648     }
1649   }
1650
1651   silc_free(server_id);
1652
1653   if (!entry) {
1654     if (dest_server)
1655       silc_server_command_send_status_data(cmd, SILC_COMMAND_INFO,
1656                                            SILC_STATUS_ERR_NO_SUCH_SERVER, 0,
1657                                            2, dest_server,
1658                                            strlen(dest_server));
1659     goto out;
1660   }
1661
1662   idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
1663   if (!server_info)
1664     server_info = entry->server_info;
1665   server_name = entry->server_name;
1666
1667   /* Send the reply */
1668   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_INFO,
1669                                                 SILC_STATUS_OK, 0, ident, 3,
1670                                                 2, idp->data, idp->len,
1671                                                 3, server_name,
1672                                                 strlen(server_name),
1673                                                 4, server_info,
1674                                                 server_info ?
1675                                                 strlen(server_info) : 0);
1676   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
1677                           packet->data, packet->len, FALSE);
1678
1679   silc_buffer_free(packet);
1680   silc_buffer_free(idp);
1681
1682  out:
1683   silc_server_command_free(cmd);
1684 }
1685
1686 /* Server side of command PING. This just replies to the ping. */
1687
1688 SILC_SERVER_CMD_FUNC(ping)
1689 {
1690   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
1691   SilcServer server = cmd->server;
1692   SilcUInt32 tmp_len;
1693   unsigned char *tmp;
1694   SilcServerID *server_id = NULL;
1695
1696   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_PING, cmd, 1, 1);
1697
1698   /* Get Server ID */
1699   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
1700   if (!tmp) {
1701     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
1702                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
1703                                           0);
1704     goto out;
1705   }
1706   server_id = silc_id_payload_parse_id(tmp, tmp_len, NULL);
1707   if (!server_id)
1708     goto out;
1709
1710   if (SILC_ID_SERVER_COMPARE(server_id, server->id)) {
1711     /* Send our reply */
1712     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
1713                                           SILC_STATUS_OK, 0);
1714   } else {
1715     silc_server_command_send_status_data(cmd, SILC_COMMAND_PING,
1716                                          SILC_STATUS_ERR_NO_SUCH_SERVER_ID, 0,
1717                                          2, tmp, tmp_len);
1718     goto out;
1719   }
1720
1721  out:
1722   silc_free(server_id);
1723   silc_server_command_free(cmd);
1724 }
1725
1726 /* Server side of command STATS. */
1727
1728 SILC_SERVER_CMD_FUNC(stats)
1729 {
1730   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
1731   SilcServer server = cmd->server;
1732   SilcServerID *server_id;
1733   unsigned char *tmp;
1734   SilcUInt32 tmp_len;
1735   SilcBuffer packet, stats;
1736   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
1737   SilcUInt32 uptime;
1738
1739   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_STATS, cmd, 1, 1);
1740
1741   /* Get Server ID */
1742   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
1743   if (!tmp) {
1744     silc_server_command_send_status_reply(cmd, SILC_COMMAND_STATS,
1745                                           SILC_STATUS_ERR_NO_SERVER_ID, 0);
1746     goto out;
1747   }
1748   server_id = silc_id_payload_parse_id(tmp, tmp_len, NULL);
1749   if (!server_id)
1750     goto out;
1751
1752   /* The ID must be ours */
1753   if (!SILC_ID_SERVER_COMPARE(server->id, server_id)) {
1754     silc_server_command_send_status_data(cmd, SILC_COMMAND_STATS,
1755                                          SILC_STATUS_ERR_NO_SUCH_SERVER_ID, 0,
1756                                          2, tmp, tmp_len);
1757     silc_free(server_id);
1758     goto out;
1759   }
1760   silc_free(server_id);
1761
1762   /* If we are router then just send everything we got. If we are normal
1763      server then we'll send this to our router to get all the latest
1764      statistical information. */
1765   if (!cmd->pending && server->server_type != SILC_ROUTER &&
1766       !server->standalone) {
1767     /* Send request to our router */
1768     SilcBuffer idp = silc_id_payload_encode(server->router->id,
1769                                             SILC_ID_SERVER);
1770     packet = silc_command_payload_encode_va(SILC_COMMAND_STATS,
1771                                             ++server->cmd_ident, 1,
1772                                             1, idp->data, idp->len);
1773     silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
1774                             SILC_PACKET_COMMAND, 0, packet->data,
1775                             packet->len, FALSE);
1776
1777     /* Reprocess this packet after received reply from router */
1778     silc_server_command_pending(server, SILC_COMMAND_STATS,
1779                                 server->cmd_ident,
1780                                 silc_server_command_stats,
1781                                 silc_server_command_dup(cmd));
1782     cmd->pending = TRUE;
1783     silc_buffer_free(packet);
1784     silc_buffer_free(idp);
1785     goto out;
1786   }
1787
1788   /* Send our reply to sender */
1789   uptime = time(NULL) - server->starttime;
1790
1791   stats = silc_buffer_alloc_size(60);
1792   silc_buffer_format(stats,
1793                      SILC_STR_UI_INT(server->starttime),
1794                      SILC_STR_UI_INT(uptime),
1795                      SILC_STR_UI_INT(server->stat.my_clients),
1796                      SILC_STR_UI_INT(server->stat.my_channels),
1797                      SILC_STR_UI_INT(server->stat.my_server_ops),
1798                      SILC_STR_UI_INT(server->stat.my_router_ops),
1799                      SILC_STR_UI_INT(server->stat.cell_clients),
1800                      SILC_STR_UI_INT(server->stat.cell_channels),
1801                      SILC_STR_UI_INT(server->stat.cell_servers),
1802                      SILC_STR_UI_INT(server->stat.clients),
1803                      SILC_STR_UI_INT(server->stat.channels),
1804                      SILC_STR_UI_INT(server->stat.servers),
1805                      SILC_STR_UI_INT(server->stat.routers),
1806                      SILC_STR_UI_INT(server->stat.server_ops),
1807                      SILC_STR_UI_INT(server->stat.router_ops),
1808                      SILC_STR_END);
1809
1810   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_STATS,
1811                                                 SILC_STATUS_OK, 0, ident, 2,
1812                                                 2, tmp, tmp_len,
1813                                                 3, stats->data, stats->len);
1814   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY,
1815                           0, packet->data, packet->len, FALSE);
1816   silc_buffer_free(packet);
1817   silc_buffer_free(stats);
1818
1819  out:
1820   silc_server_command_free(cmd);
1821 }
1822
1823 /* Internal routine to join channel. The channel sent to this function
1824    has been either created or resolved from ID lists. This joins the sent
1825    client to the channel. */
1826
1827 static void silc_server_command_join_channel(SilcServer server,
1828                                              SilcServerCommandContext cmd,
1829                                              SilcChannelEntry channel,
1830                                              SilcClientID *client_id,
1831                                              bool created,
1832                                              bool create_key,
1833                                              SilcUInt32 umode,
1834                                              const unsigned char *auth,
1835                                              SilcUInt32 auth_len,
1836                                              const unsigned char *cauth,
1837                                              SilcUInt32 cauth_len)
1838 {
1839   SilcSocketConnection sock = cmd->sock;
1840   unsigned char *tmp;
1841   SilcUInt32 tmp_len, user_count;
1842   unsigned char *passphrase = NULL, mode[4], tmp2[4], tmp3[4];
1843   SilcClientEntry client;
1844   SilcChannelClientEntry chl;
1845   SilcBuffer reply, chidp, clidp, keyp = NULL;
1846   SilcBuffer user_list, mode_list, invite_list, ban_list;
1847   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
1848   char check[512], check2[512];
1849   bool founder = FALSE;
1850   bool resolve;
1851   SilcBuffer fkey = NULL, chpklist = NULL;
1852   const char *cipher;
1853
1854   SILC_LOG_DEBUG(("Joining client to channel"));
1855
1856   if (!channel)
1857     return;
1858
1859   /* Get the client entry */
1860   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
1861     client = (SilcClientEntry)sock->user_data;
1862     if (!client)
1863       return;
1864   } else {
1865     client = silc_server_query_client(server, client_id, FALSE,
1866                                       &resolve);
1867     if (!client) {
1868       if (!resolve || cmd->pending) {
1869         silc_server_command_send_status_reply(
1870                                          cmd, SILC_COMMAND_JOIN,
1871                                          SILC_STATUS_ERR_NOT_ENOUGH_PARAMS, 0);
1872         goto out;
1873       }
1874
1875       /* The client info is being resolved. Reprocess this packet after
1876          receiving the reply to the query. */
1877       silc_server_command_pending(server, SILC_COMMAND_WHOIS,
1878                                   server->cmd_ident,
1879                                   silc_server_command_join,
1880                                   silc_server_command_dup(cmd));
1881       cmd->pending = TRUE;
1882       goto out;
1883     }
1884
1885     if (!client->data.public_key &&
1886         (auth || cauth || channel->ban_list ||
1887          (channel->mode & SILC_CHANNEL_MODE_INVITE))) {
1888       if (cmd->pending == 2)
1889         goto out;
1890
1891       /* We must retrieve the client's public key by sending
1892          GETKEY command. Reprocess this packet after receiving the key */
1893       clidp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
1894       silc_server_send_command(server, cmd->sock,
1895                                SILC_COMMAND_GETKEY, ++server->cmd_ident,
1896                                1, 1, clidp->data, clidp->len);
1897       silc_buffer_free(clidp);
1898       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
1899                                   server->cmd_ident,
1900                                   silc_server_command_join,
1901                                   silc_server_command_dup(cmd));
1902       cmd->pending = 2;
1903       goto out;
1904     }
1905
1906     cmd->pending = FALSE;
1907   }
1908
1909   /*
1910    * Check founder auth payload if provided.  If client can gain founder
1911    * privileges it can override various conditions on joining the channel,
1912    * and can have directly the founder mode set on the channel.
1913    */
1914   if (auth && auth_len && channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
1915     SilcIDListData idata = (SilcIDListData)client;
1916     SilcChannelClientEntry chl2;
1917     SilcHashTableList htl;
1918
1919     if (channel->founder_key && idata->public_key &&
1920         silc_pkcs_public_key_compare(channel->founder_key,
1921                                      idata->public_key)) {
1922       /* Check whether the client is to become founder */
1923       if (silc_auth_verify_data(auth, auth_len, SILC_AUTH_PUBLIC_KEY,
1924                                 channel->founder_key, 0, server->sha1hash,
1925                                 client->id, SILC_ID_CLIENT)) {
1926
1927         /* There cannot be anyone else as founder on the channel now.  This
1928            client is definitely the founder due to this authentication */
1929         silc_hash_table_list(channel->user_list, &htl);
1930         while (silc_hash_table_get(&htl, NULL, (void *)&chl2))
1931           if (chl2->mode & SILC_CHANNEL_UMODE_CHANFO) {
1932             chl2->mode &= ~SILC_CHANNEL_UMODE_CHANFO;
1933             silc_server_force_cumode_change(server, NULL, channel, chl2,
1934                                             chl2->mode);
1935             break;
1936           }
1937         silc_hash_table_list_reset(&htl);
1938
1939         umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
1940         founder = TRUE;
1941       }
1942     }
1943   }
1944
1945   /*
1946    * Check channel modes
1947    */
1948
1949   if (!umode) {
1950     memset(check, 0, sizeof(check));
1951     memset(check2, 0, sizeof(check2));
1952     silc_strncat(check, sizeof(check),
1953                  client->nickname, strlen(client->nickname));
1954     silc_strncat(check, sizeof(check), "!", 1);
1955     silc_strncat(check, sizeof(check),
1956                  client->username, strlen(client->username));
1957     if (!strchr(client->username, '@')) {
1958       silc_strncat(check, sizeof(check), "@", 1);
1959       silc_strncat(check, sizeof(check),
1960                    cmd->sock->hostname, strlen(cmd->sock->hostname));
1961     }
1962
1963     silc_strncat(check2, sizeof(check2),
1964                  client->nickname, strlen(client->nickname));
1965     if (!strchr(client->nickname, '@')) {
1966       silc_strncat(check2, sizeof(check2), "@", 1);
1967       silc_strncat(check2, sizeof(check2),
1968                    server->server_name, strlen(server->server_name));
1969     }
1970     silc_strncat(check2, sizeof(check2), "!", 1);
1971     silc_strncat(check2, sizeof(check2),
1972                  client->username, strlen(client->username));
1973     if (!strchr(client->username, '@')) {
1974       silc_strncat(check2, sizeof(check2), "@", 1);
1975       silc_strncat(check2, sizeof(check2),
1976                    cmd->sock->hostname, strlen(cmd->sock->hostname));
1977     }
1978
1979     /* Check invite list if channel is invite-only channel */
1980     if (channel->mode & SILC_CHANNEL_MODE_INVITE) {
1981       if (!channel->invite_list ||
1982           !silc_hash_table_count(channel->invite_list) ||
1983           (!silc_server_inviteban_match(server, channel->invite_list,
1984                                         3, client->id) &&
1985            !silc_server_inviteban_match(server, channel->invite_list,
1986                                         2, client->data.public_key) &&
1987            !silc_server_inviteban_match(server, channel->invite_list,
1988                                         1, client->nickname) &&
1989            !silc_server_inviteban_match(server, channel->invite_list,
1990                                         1, check) &&
1991            !silc_server_inviteban_match(server, channel->invite_list,
1992                                         1, check2))) {
1993         chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
1994         silc_server_command_send_status_data(cmd, SILC_COMMAND_JOIN,
1995                                              SILC_STATUS_ERR_NOT_INVITED, 0,
1996                                              2, chidp->data, chidp->len);
1997         silc_buffer_free(chidp);
1998         goto out;
1999       }
2000     }
2001
2002     /* Check ban list if it exists. If the client's nickname, server,
2003        username and/or hostname is in the ban list the access to the
2004        channel is denied. */
2005     if (channel->ban_list && silc_hash_table_count(channel->ban_list)) {
2006       if (silc_server_inviteban_match(server, channel->ban_list,
2007                                       3, client->id) ||
2008           silc_server_inviteban_match(server, channel->ban_list,
2009                                       2, client->data.public_key) ||
2010           silc_server_inviteban_match(server, channel->ban_list,
2011                                       1, client->nickname) ||
2012           silc_server_inviteban_match(server, channel->ban_list,
2013                                       1, check) ||
2014           silc_server_inviteban_match(server, channel->ban_list,
2015                                       1, check2)) {
2016         chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2017         silc_server_command_send_status_data(
2018                                       cmd, SILC_COMMAND_JOIN,
2019                                       SILC_STATUS_ERR_BANNED_FROM_CHANNEL, 0,
2020                                       2, chidp->data, chidp->len);
2021         silc_buffer_free(chidp);
2022         goto out;
2023       }
2024     }
2025
2026     /* Check user count limit if set. */
2027     if (channel->mode & SILC_CHANNEL_MODE_ULIMIT) {
2028       if (silc_hash_table_count(channel->user_list) + 1 >
2029           channel->user_limit) {
2030         chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2031         silc_server_command_send_status_data(cmd, SILC_COMMAND_JOIN,
2032                                              SILC_STATUS_ERR_CHANNEL_IS_FULL,
2033                                              0, 2, chidp->data, chidp->len);
2034         silc_buffer_free(chidp);
2035         goto out;
2036       }
2037     }
2038   }
2039
2040   /* Check the channel passphrase if set. */
2041   if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
2042     /* Get passphrase */
2043     tmp = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
2044     if (tmp)
2045       passphrase = silc_memdup(tmp, tmp_len);
2046
2047     if (!passphrase || !channel->passphrase ||
2048         memcmp(passphrase, channel->passphrase, strlen(channel->passphrase))) {
2049       chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2050       silc_server_command_send_status_data(cmd, SILC_COMMAND_JOIN,
2051                                            SILC_STATUS_ERR_BAD_PASSWORD, 0,
2052                                            2, chidp->data, chidp->len);
2053       silc_buffer_free(chidp);
2054       goto out;
2055     }
2056   }
2057
2058   /* Verify channel authentication with channel public keys if set. */
2059   if (channel->mode & SILC_CHANNEL_MODE_CHANNEL_AUTH) {
2060     if (!silc_server_verify_channel_auth(server, channel, client->id,
2061                                          cauth, cauth_len)) {
2062       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2063                                             SILC_STATUS_ERR_PERM_DENIED, 0);
2064       goto out;
2065     }
2066   }
2067
2068   /*
2069    * Client is allowed to join to the channel. Make it happen.
2070    */
2071
2072   /* Check whether the client already is on the channel */
2073   if (silc_server_client_on_channel(client, channel, NULL)) {
2074     clidp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
2075     chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2076     silc_server_command_send_status_data2(cmd, SILC_COMMAND_JOIN,
2077                                           SILC_STATUS_ERR_USER_ON_CHANNEL, 0,
2078                                           2, clidp->data, clidp->len,
2079                                           3, chidp->data, chidp->len);
2080     silc_buffer_free(clidp);
2081     silc_buffer_free(chidp);
2082     goto out;
2083   }
2084
2085   /* Generate new channel key as protocol dictates */
2086   if (create_key) {
2087     if (!silc_server_create_channel_key(server, channel, 0))
2088       goto out;
2089
2090     /* Send the channel key. This is broadcasted to the channel but is not
2091        sent to the client who is joining to the channel. */
2092     if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY))
2093       silc_server_send_channel_key(server, NULL, channel,
2094                                    server->server_type == SILC_ROUTER ?
2095                                    FALSE : !server->standalone);
2096   }
2097
2098   /* Join the client to the channel by adding it to channel's user list.
2099      Add also the channel to client entry's channels list for fast cross-
2100      referencing. */
2101   chl = silc_calloc(1, sizeof(*chl));
2102   chl->mode = umode;
2103   chl->client = client;
2104   chl->channel = channel;
2105   silc_hash_table_add(channel->user_list, client, chl);
2106   silc_hash_table_add(client->channels, channel, chl);
2107   channel->user_count++;
2108   channel->disabled = FALSE;
2109
2110   /* Get users on the channel */
2111   silc_server_get_users_on_channel(server, channel, &user_list, &mode_list,
2112                                    &user_count);
2113
2114   /* Encode Client ID Payload of the original client who wants to join */
2115   clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2116
2117   /* Encode command reply packet */
2118   chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2119   SILC_PUT32_MSB(channel->mode, mode);
2120   SILC_PUT32_MSB(created, tmp2);
2121   SILC_PUT32_MSB(user_count, tmp3);
2122
2123   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2124     tmp = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
2125     cipher = silc_cipher_get_name(channel->channel_key);
2126     keyp = silc_channel_key_payload_encode(silc_id_get_len(channel->id,
2127                                                            SILC_ID_CHANNEL),
2128                                            tmp,
2129                                            strlen(cipher), cipher,
2130                                            channel->key_len / 8, channel->key);
2131     silc_free(tmp);
2132   }
2133
2134   if (channel->founder_key)
2135     fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
2136
2137   /* Encode invite list */
2138   invite_list = NULL;
2139   if (channel->invite_list && silc_hash_table_count(channel->invite_list)) {
2140     SilcHashTableList htl;
2141
2142     invite_list = silc_buffer_alloc_size(2);
2143     silc_buffer_format(invite_list,
2144                        SILC_STR_UI_SHORT(silc_hash_table_count(
2145                                           channel->invite_list)),
2146                        SILC_STR_END);
2147
2148     silc_hash_table_list(channel->invite_list, &htl);
2149     while (silc_hash_table_get(&htl, (void *)&tmp_len, (void *)&reply))
2150       invite_list = silc_argument_payload_encode_one(invite_list,
2151                                                      reply->data,
2152                                                      reply->len, tmp_len);
2153     silc_hash_table_list_reset(&htl);
2154   }
2155
2156   /* Encode ban list */
2157   ban_list = NULL;
2158   if (channel->ban_list && silc_hash_table_count(channel->ban_list)) {
2159     SilcHashTableList htl;
2160
2161     ban_list = silc_buffer_alloc_size(2);
2162     silc_buffer_format(ban_list,
2163                        SILC_STR_UI_SHORT(silc_hash_table_count(
2164                                           channel->ban_list)),
2165                        SILC_STR_END);
2166
2167     silc_hash_table_list(channel->ban_list, &htl);
2168     while (silc_hash_table_get(&htl, (void *)&tmp_len, (void *)&reply))
2169       ban_list = silc_argument_payload_encode_one(ban_list,
2170                                                   reply->data,
2171                                                   reply->len, tmp_len);
2172     silc_hash_table_list_reset(&htl);
2173   }
2174
2175   if (channel->channel_pubkeys)
2176     chpklist = silc_server_get_channel_pk_list(server, channel, FALSE, FALSE);
2177
2178   reply =
2179     silc_command_reply_payload_encode_va(SILC_COMMAND_JOIN,
2180                                          SILC_STATUS_OK, 0, ident, 15,
2181                                          2, channel->channel_name,
2182                                          strlen(channel->channel_name),
2183                                          3, chidp->data, chidp->len,
2184                                          4, clidp->data, clidp->len,
2185                                          5, mode, 4,
2186                                          6, tmp2, 4,
2187                                          7, keyp ? keyp->data : NULL,
2188                                          keyp ? keyp->len : 0,
2189                                          8, ban_list ? ban_list->data : NULL,
2190                                          ban_list ? ban_list->len : 0,
2191                                          9, invite_list ? invite_list->data :
2192                                          NULL,
2193                                          invite_list ? invite_list->len : 0,
2194                                          10, channel->topic,
2195                                          channel->topic ?
2196                                          strlen(channel->topic) : 0,
2197                                          11, silc_hmac_get_name(channel->hmac),
2198                                          strlen(silc_hmac_get_name(channel->
2199                                                                    hmac)),
2200                                          12, tmp3, 4,
2201                                          13, user_list->data, user_list->len,
2202                                          14, mode_list->data,
2203                                          mode_list->len,
2204                                          15, fkey ? fkey->data : NULL,
2205                                          fkey ? fkey->len : 0,
2206                                          16, chpklist ? chpklist->data : NULL,
2207                                          chpklist ? chpklist->len : 0);
2208
2209   /* Send command reply */
2210   silc_server_packet_send(server, sock, SILC_PACKET_COMMAND_REPLY, 0,
2211                           reply->data, reply->len, FALSE);
2212
2213   /* Send JOIN notify to locally connected clients on the channel. If
2214      we are normal server then router will send or have sent JOIN notify
2215      already. However since we've added the client already to our channel
2216      we'll ignore it (in packet_receive.c) so we must send it here. If
2217      we are router then this will send it to local clients and local
2218      servers. */
2219   SILC_LOG_DEBUG(("Send JOIN notify to channel"));
2220   silc_server_send_notify_to_channel(server, NULL, channel, FALSE, TRUE,
2221                                      SILC_NOTIFY_TYPE_JOIN, 2,
2222                                      clidp->data, clidp->len,
2223                                      chidp->data, chidp->len);
2224
2225   /* Update statistics */
2226   server->stat.my_chanclients++;
2227   if (server->server_type == SILC_ROUTER) {
2228     server->stat.cell_chanclients++;
2229     server->stat.chanclients++;
2230   }
2231
2232   if (!cmd->pending) {
2233     /* Send JOIN notify packet to our primary router */
2234     silc_server_send_notify_join(server, SILC_PRIMARY_ROUTE(server),
2235                                  SILC_BROADCAST(server), channel, client->id);
2236
2237     if (keyp)
2238       /* Distribute the channel key to all backup routers. */
2239       silc_server_backup_send(server, NULL, SILC_PACKET_CHANNEL_KEY, 0,
2240                               keyp->data, keyp->len, FALSE, TRUE);
2241
2242     /* If client became founder by providing correct founder auth data
2243        notify the mode change to the channel. */
2244     if (founder) {
2245       SILC_PUT32_MSB(chl->mode, mode);
2246       SILC_LOG_DEBUG(("Send CUMODE_CHANGE notify to channel"));
2247       silc_server_send_notify_to_channel(server, NULL, channel, FALSE, TRUE,
2248                                          SILC_NOTIFY_TYPE_CUMODE_CHANGE, 4,
2249                                          clidp->data, clidp->len,
2250                                          mode, 4, clidp->data, clidp->len,
2251                                          fkey ? fkey->data : NULL,
2252                                          fkey ? fkey->len : 0);
2253     }
2254   }
2255
2256   /* Set CUMODE notify type to network */
2257   if (founder)
2258     silc_server_send_notify_cumode(server, SILC_PRIMARY_ROUTE(server),
2259                                    SILC_BROADCAST(server), channel,
2260                                    chl->mode, client->id, SILC_ID_CLIENT,
2261                                    client->id, channel->founder_key);
2262
2263   silc_buffer_free(reply);
2264   silc_buffer_free(clidp);
2265   silc_buffer_free(chidp);
2266   silc_buffer_free(keyp);
2267   silc_buffer_free(user_list);
2268   silc_buffer_free(mode_list);
2269   silc_buffer_free(fkey);
2270   silc_buffer_free(chpklist);
2271   silc_buffer_free(invite_list);
2272   silc_buffer_free(ban_list);
2273
2274  out:
2275   if (passphrase)
2276     memset(passphrase, 0, strlen(passphrase));
2277   silc_free(passphrase);
2278 }
2279
2280 /* Server side of command JOIN. Joins client into requested channel. If
2281    the channel does not exist it will be created. */
2282
2283 SILC_SERVER_CMD_FUNC(join)
2284 {
2285   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2286   SilcServer server = cmd->server;
2287   unsigned char *auth, *cauth;
2288   SilcUInt32 tmp_len, auth_len, cauth_len;
2289   char *tmp, *channel_name = NULL, *cipher, *hmac;
2290   SilcChannelEntry channel;
2291   SilcUInt32 umode = 0;
2292   bool created = FALSE, create_key = TRUE;
2293   SilcClientID *client_id;
2294
2295   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_JOIN, cmd, 2, 7);
2296
2297   /* Get channel name */
2298   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
2299   if (!tmp) {
2300     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2301                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
2302                                           0);
2303     goto out;
2304   }
2305   channel_name = tmp;
2306
2307   if (tmp_len > 256)
2308     channel_name[255] = '\0';
2309
2310   if (silc_server_name_bad_chchars(channel_name, tmp_len) == TRUE) {
2311     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2312                                           SILC_STATUS_ERR_BAD_CHANNEL, 0);
2313     goto out;
2314   }
2315
2316   /* Get Client ID of the client who is joining to the channel */
2317   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
2318   if (!tmp) {
2319     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2320                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
2321                                           0);
2322     goto out;
2323   }
2324   client_id = silc_id_payload_parse_id(tmp, tmp_len, NULL);
2325   if (!client_id) {
2326     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2327                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
2328                                           0);
2329     goto out;
2330   }
2331
2332   /* Get cipher, hmac name and auth payload */
2333   cipher = silc_argument_get_arg_type(cmd->args, 4, NULL);
2334   hmac = silc_argument_get_arg_type(cmd->args, 5, NULL);
2335   auth = silc_argument_get_arg_type(cmd->args, 6, &auth_len);
2336   cauth = silc_argument_get_arg_type(cmd->args, 7, &cauth_len);
2337
2338   /* See if the channel exists */
2339   channel = silc_idlist_find_channel_by_name(server->local_list,
2340                                              channel_name, NULL);
2341
2342   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
2343     SilcClientEntry entry = (SilcClientEntry)cmd->sock->user_data;
2344     if (!entry) {
2345       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2346                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
2347                                             0);
2348       goto out;
2349     }
2350
2351     silc_free(client_id);
2352     client_id = silc_id_dup(entry->id, SILC_ID_CLIENT);
2353
2354     if (!channel ||
2355         (channel->disabled && server->server_type != SILC_ROUTER)) {
2356       /* Channel not found or not valid */
2357
2358       /* If we are standalone server we don't have a router, we just create
2359          the channel by ourselves (unless it existed). */
2360       if (server->standalone) {
2361         if (!channel) {
2362           channel = silc_server_create_new_channel(server, server->id, cipher,
2363                                                    hmac, channel_name, TRUE);
2364           if (!channel) {
2365             silc_server_command_send_status_data(
2366                                   cmd, SILC_COMMAND_JOIN,
2367                                   SILC_STATUS_ERR_UNKNOWN_ALGORITHM,
2368                                   0, 2, cipher, strlen(cipher));
2369             silc_free(client_id);
2370             goto out;
2371           }
2372
2373           umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
2374           created = TRUE;
2375           create_key = FALSE;
2376         }
2377       } else {
2378
2379         /* The channel does not exist on our server. If we are normal server
2380            we will send JOIN command to our router which will handle the
2381            joining procedure (either creates the channel if it doesn't exist
2382            or joins the client to it). */
2383         if (server->server_type != SILC_ROUTER) {
2384           SilcBuffer tmpbuf;
2385           SilcUInt16 old_ident;
2386
2387           /* If this is pending command callback then we've resolved
2388              it and it didn't work, return since we've notified the
2389              client already in the command reply callback. */
2390           if (cmd->pending) {
2391             silc_free(client_id);
2392             goto out;
2393           }
2394
2395           old_ident = silc_command_get_ident(cmd->payload);
2396           silc_command_set_ident(cmd->payload, ++server->cmd_ident);
2397           tmpbuf = silc_command_payload_encode_payload(cmd->payload);
2398
2399           /* Send JOIN command to our router */
2400           silc_server_packet_send(server, (SilcSocketConnection)
2401                                   SILC_PRIMARY_ROUTE(server),
2402                                   SILC_PACKET_COMMAND, cmd->packet->flags,
2403                                   tmpbuf->data, tmpbuf->len, TRUE);
2404
2405           /* Reprocess this packet after received reply from router */
2406           silc_server_command_pending(server, SILC_COMMAND_JOIN,
2407                                       silc_command_get_ident(cmd->payload),
2408                                       silc_server_command_join,
2409                                       silc_server_command_dup(cmd));
2410           cmd->pending = TRUE;
2411           silc_command_set_ident(cmd->payload, old_ident);
2412           silc_buffer_free(tmpbuf);
2413           silc_free(client_id);
2414           goto out;
2415         }
2416
2417         /* We are router and the channel does not seem exist so we will check
2418            our global list as well for the channel. */
2419         channel = silc_idlist_find_channel_by_name(server->global_list,
2420                                                    channel_name, NULL);
2421         if (!channel) {
2422           /* Channel really does not exist, create it */
2423           channel = silc_server_create_new_channel(server, server->id, cipher,
2424                                                    hmac, channel_name, TRUE);
2425           if (!channel) {
2426             silc_server_command_send_status_data(
2427                                        cmd, SILC_COMMAND_JOIN,
2428                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM, 0,
2429                                        2, cipher, strlen(cipher));
2430             silc_free(client_id);
2431             goto out;
2432           }
2433
2434           umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
2435           created = TRUE;
2436           create_key = FALSE;
2437         }
2438       }
2439     }
2440   } else {
2441     if (!channel) {
2442       /* Channel not found */
2443
2444       /* If the command came from router and we are normal server then
2445          something went wrong with the joining as the channel was not found.
2446          We can't do anything else but ignore this. */
2447       if (cmd->sock->type == SILC_SOCKET_TYPE_ROUTER ||
2448           server->server_type != SILC_ROUTER) {
2449         silc_free(client_id);
2450         goto out;
2451       }
2452
2453       /* We are router and the channel does not seem exist so we will check
2454          our global list as well for the channel. */
2455       channel = silc_idlist_find_channel_by_name(server->global_list,
2456                                                  channel_name, NULL);
2457       if (!channel) {
2458         /* Channel really does not exist, create it */
2459         channel = silc_server_create_new_channel(server, server->id, cipher,
2460                                                  hmac, channel_name, TRUE);
2461         if (!channel) {
2462           silc_server_command_send_status_data(
2463                                        cmd, SILC_COMMAND_JOIN,
2464                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM, 0,
2465                                        2, cipher, strlen(cipher));
2466           silc_free(client_id);
2467           goto out;
2468         }
2469
2470         umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
2471         created = TRUE;
2472         create_key = FALSE;
2473       }
2474     }
2475   }
2476
2477   /* Check whether the channel was created by our router */
2478   if (cmd->pending && context2) {
2479     SilcServerCommandReplyContext reply = context2;
2480
2481     if (silc_command_get(reply->payload) == SILC_COMMAND_JOIN) {
2482       tmp = silc_argument_get_arg_type(reply->args, 6, NULL);
2483       SILC_GET32_MSB(created, tmp);
2484       if (silc_argument_get_arg_type(reply->args, 7, NULL))
2485         create_key = FALSE;     /* Router returned the key already */
2486
2487       if (silc_command_get_status(reply->payload, NULL, NULL) &&
2488           channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
2489         /* Save channel passphrase, if user provided it successfully */
2490         unsigned char *pa;
2491         SilcUInt32 pa_len;
2492         pa = silc_argument_get_arg_type(cmd->args, 3, &pa_len);
2493         if (pa) {
2494           silc_free(channel->passphrase);
2495           channel->passphrase = silc_memdup(pa, pa_len);
2496         }
2497       }
2498     }
2499
2500     if (silc_command_get(reply->payload) == SILC_COMMAND_WHOIS &&
2501         !channel->disabled && !silc_hash_table_count(channel->user_list))
2502       created = TRUE;
2503   }
2504
2505   /* If the channel does not have global users and is also empty the client
2506      will be the channel founder and operator. */
2507   if (!channel->disabled &&
2508       !channel->global_users && !silc_hash_table_count(channel->user_list))
2509     umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
2510
2511   /* Join to the channel */
2512   silc_server_command_join_channel(server, cmd, channel, client_id,
2513                                    created, create_key, umode,
2514                                    auth, auth_len, cauth, cauth_len);
2515
2516   silc_free(client_id);
2517
2518  out:
2519   silc_server_command_free(cmd);
2520 }
2521
2522 /* Server side of command MOTD. Sends server's current "message of the
2523    day" to the client. */
2524
2525 SILC_SERVER_CMD_FUNC(motd)
2526 {
2527   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2528   SilcServer server = cmd->server;
2529   SilcBuffer packet, idp;
2530   char *motd, *dest_server;
2531   SilcUInt32 motd_len;
2532   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
2533
2534   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_MOTD, cmd, 1, 1);
2535
2536   /* Get server name */
2537   dest_server = silc_argument_get_arg_type(cmd->args, 1, NULL);
2538   if (!dest_server) {
2539     silc_server_command_send_status_reply(cmd, SILC_COMMAND_MOTD,
2540                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
2541                                           0);
2542     goto out;
2543   }
2544
2545   if (!strncasecmp(dest_server, server->server_name, strlen(dest_server))) {
2546     /* Send our MOTD */
2547
2548     idp = silc_id_payload_encode(server->id_entry->id, SILC_ID_SERVER);
2549
2550     if (server->config && server->config->server_info &&
2551         server->config->server_info->motd_file) {
2552       /* Send motd */
2553       motd = silc_file_readfile(server->config->server_info->motd_file,
2554                                 &motd_len);
2555       if (!motd)
2556         goto out;
2557
2558       motd[motd_len] = 0;
2559       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
2560                                                     SILC_STATUS_OK, 0,
2561                                                     ident, 2,
2562                                                     2, idp, idp->len,
2563                                                     3, motd, motd_len);
2564     } else {
2565       /* No motd */
2566       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
2567                                                     SILC_STATUS_OK, 0,
2568                                                     ident, 1,
2569                                                     2, idp, idp->len);
2570     }
2571
2572     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
2573                             packet->data, packet->len, FALSE);
2574     silc_buffer_free(packet);
2575     silc_buffer_free(idp);
2576   } else {
2577     SilcServerEntry entry;
2578
2579     /* Check whether we have this server cached */
2580     entry = silc_idlist_find_server_by_name(server->global_list,
2581                                             dest_server, TRUE, NULL);
2582     if (!entry) {
2583       entry = silc_idlist_find_server_by_name(server->local_list,
2584                                               dest_server, TRUE, NULL);
2585     }
2586
2587     if (server->server_type != SILC_SERVER && !cmd->pending &&
2588         entry && !entry->motd) {
2589       /* Send to the server */
2590       SilcBuffer tmpbuf;
2591       SilcUInt16 old_ident;
2592
2593       old_ident = silc_command_get_ident(cmd->payload);
2594       silc_command_set_ident(cmd->payload, ++server->cmd_ident);
2595       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
2596
2597       silc_server_packet_send(server, entry->connection,
2598                               SILC_PACKET_COMMAND, cmd->packet->flags,
2599                               tmpbuf->data, tmpbuf->len, TRUE);
2600
2601       /* Reprocess this packet after received reply from router */
2602       silc_server_command_pending(server, SILC_COMMAND_MOTD,
2603                                   silc_command_get_ident(cmd->payload),
2604                                   silc_server_command_motd,
2605                                   silc_server_command_dup(cmd));
2606       cmd->pending = TRUE;
2607       silc_command_set_ident(cmd->payload, old_ident);
2608       silc_buffer_free(tmpbuf);
2609       goto out;
2610     }
2611
2612     if (!entry && !cmd->pending && !server->standalone) {
2613       /* Send to the primary router */
2614       SilcBuffer tmpbuf;
2615       SilcUInt16 old_ident;
2616
2617       old_ident = silc_command_get_ident(cmd->payload);
2618       silc_command_set_ident(cmd->payload, ++server->cmd_ident);
2619       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
2620
2621       silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
2622                               SILC_PACKET_COMMAND, cmd->packet->flags,
2623                               tmpbuf->data, tmpbuf->len, TRUE);
2624
2625       /* Reprocess this packet after received reply from router */
2626       silc_server_command_pending(server, SILC_COMMAND_MOTD,
2627                                   silc_command_get_ident(cmd->payload),
2628                                   silc_server_command_motd,
2629                                   silc_server_command_dup(cmd));
2630       cmd->pending = TRUE;
2631       silc_command_set_ident(cmd->payload, old_ident);
2632       silc_buffer_free(tmpbuf);
2633       goto out;
2634     }
2635
2636     if (!entry) {
2637       silc_server_command_send_status_data(cmd, SILC_COMMAND_MOTD,
2638                                            SILC_STATUS_ERR_NO_SUCH_SERVER, 0,
2639                                            2, dest_server,
2640                                            strlen(dest_server));
2641       goto out;
2642     }
2643
2644     idp = silc_id_payload_encode(server->id_entry->id, SILC_ID_SERVER);
2645     packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
2646                                                   SILC_STATUS_OK, 0, ident, 2,
2647                                                   2, idp, idp->len,
2648                                                   3, entry->motd,
2649                                                   entry->motd ?
2650                                                   strlen(entry->motd) : 0);
2651     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
2652                             packet->data, packet->len, FALSE);
2653     silc_buffer_free(packet);
2654     silc_buffer_free(idp);
2655   }
2656
2657  out:
2658   silc_server_command_free(cmd);
2659 }
2660
2661 /* Server side of command UMODE. Client can use this command to set/unset
2662    user mode. Client actually cannot set itself to be as server/router
2663    operator so this can be used only to unset the modes. */
2664
2665 SILC_SERVER_CMD_FUNC(umode)
2666 {
2667   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2668   SilcServer server = cmd->server;
2669   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
2670   SilcBuffer packet;
2671   unsigned char *tmp_mask, m[4];
2672   SilcUInt32 mask = 0;
2673   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
2674   bool set_mask = FALSE;
2675
2676   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
2677     goto out;
2678
2679   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_UMODE, cmd, 1, 2);
2680
2681   /* Get the client's mode mask */
2682   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL);
2683   if (tmp_mask) {
2684     SILC_GET32_MSB(mask, tmp_mask);
2685     set_mask = TRUE;
2686   }
2687
2688   if (set_mask) {
2689     /* Check that mode changing is allowed. */
2690     if (!silc_server_check_umode_rights(server, client, mask)) {
2691       silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
2692                                             SILC_STATUS_ERR_PERM_DENIED, 0);
2693       goto out;
2694     }
2695
2696     /* Anonymous mode cannot be set by client */
2697     if (mask & SILC_UMODE_ANONYMOUS &&
2698         !(client->mode & SILC_UMODE_ANONYMOUS)) {
2699       silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
2700                                             SILC_STATUS_ERR_PERM_DENIED, 0);
2701       goto out;
2702     }
2703
2704     /* Update statistics */
2705     if (mask & SILC_UMODE_GONE) {
2706       if (!(client->mode & SILC_UMODE_GONE))
2707         server->stat.my_aways++;
2708     } else {
2709       if (client->mode & SILC_UMODE_GONE)
2710         server->stat.my_aways--;
2711     }
2712
2713     /* If the client has anonymous mode set, preserve it. */
2714     if (client->mode & SILC_UMODE_ANONYMOUS)
2715       mask |= SILC_UMODE_ANONYMOUS;
2716
2717     /* Change the mode */
2718     client->mode = mask;
2719
2720     /* Send UMODE change to primary router */
2721     silc_server_send_notify_umode(server, SILC_PRIMARY_ROUTE(server),
2722                                   SILC_BROADCAST(server), client->id,
2723                                   client->mode);
2724
2725     /* Check if anyone is watching this nickname */
2726     if (server->server_type == SILC_ROUTER)
2727       silc_server_check_watcher_list(server, client, NULL,
2728                                      SILC_NOTIFY_TYPE_UMODE_CHANGE);
2729   }
2730
2731   /* Send command reply to sender */
2732   SILC_PUT32_MSB(client->mode, m);
2733   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_UMODE,
2734                                                 SILC_STATUS_OK, 0, ident, 1,
2735                                                 2, m, sizeof(m));
2736   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
2737                           packet->data, packet->len, FALSE);
2738   silc_buffer_free(packet);
2739
2740  out:
2741   silc_server_command_free(cmd);
2742 }
2743
2744 /* Server side command of CMODE. Changes channel mode */
2745
2746 SILC_SERVER_CMD_FUNC(cmode)
2747 {
2748   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2749   SilcServer server = cmd->server;
2750   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
2751   SilcIDListData idata = (SilcIDListData)client;
2752   SilcChannelID *channel_id = NULL;
2753   SilcChannelEntry channel;
2754   SilcChannelClientEntry chl;
2755   SilcBuffer packet, cidp;
2756   unsigned char *tmp, *tmp_id, *tmp_mask, *chpkdata = NULL;
2757   char *cipher = NULL, *hmac = NULL, *passphrase = NULL;
2758   SilcUInt32 mode_mask = 0, old_mask = 0, tmp_len, tmp_len2, chpklen;
2759   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
2760   bool set_mask = FALSE, set_chpk = FALSE;
2761   SilcPublicKey founder_key = NULL;
2762   SilcBuffer fkey = NULL, chpklist = NULL;
2763   SilcBufferStruct chpk;
2764
2765   if (!client) {
2766     silc_server_command_free(cmd);
2767     return;
2768   }
2769
2770   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CMODE, cmd, 1, 9);
2771
2772   /* Get Channel ID */
2773   tmp_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_len2);
2774   if (!tmp_id) {
2775     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
2776                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
2777     silc_server_command_free(cmd);
2778     return;
2779   }
2780   channel_id = silc_id_payload_parse_id(tmp_id, tmp_len2, NULL);
2781   if (!channel_id) {
2782     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
2783                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
2784     silc_server_command_free(cmd);
2785     return;
2786   }
2787
2788   /* Get channel entry */
2789   channel = silc_idlist_find_channel_by_id(server->local_list,
2790                                            channel_id, NULL);
2791   if (!channel) {
2792     channel = silc_idlist_find_channel_by_id(server->global_list,
2793                                              channel_id, NULL);
2794     if (!channel) {
2795       silc_server_command_send_status_data(cmd, SILC_COMMAND_CMODE,
2796                                            SILC_STATUS_ERR_NO_SUCH_CHANNEL_ID,
2797                                            0, 2, tmp_id, tmp_len2);
2798       silc_free(channel_id);
2799       silc_server_command_free(cmd);
2800       return;
2801     }
2802   }
2803   old_mask = channel->mode;
2804
2805   /* Get the channel mode mask */
2806   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
2807   if (tmp_mask) {
2808     SILC_GET32_MSB(mode_mask, tmp_mask);
2809     set_mask = TRUE;
2810   }
2811
2812   /* Check whether this client is on the channel */
2813   if (!silc_server_client_on_channel(client, channel, &chl)) {
2814     silc_server_command_send_status_data(cmd, SILC_COMMAND_CMODE,
2815                                          SILC_STATUS_ERR_NOT_ON_CHANNEL, 0,
2816                                          2, tmp_id, tmp_len2);
2817     goto out;
2818   }
2819
2820   /* Check that client has rights to change any requested channel modes */
2821   if (set_mask && !silc_server_check_cmode_rights(server, channel, chl,
2822                                                   mode_mask)) {
2823     SILC_LOG_DEBUG(("Client does not have rights to change mode"));
2824     silc_server_command_send_status_data(
2825                              cmd, SILC_COMMAND_CMODE,
2826                              (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP) ?
2827                               SILC_STATUS_ERR_NO_CHANNEL_PRIV :
2828                               SILC_STATUS_ERR_NO_CHANNEL_FOPRIV), 0,
2829                              2, tmp_id, tmp_len2);
2830     goto out;
2831   }
2832
2833   /* If mode mask was not sent as argument then merely return the current
2834      mode mask, founder key and channel public key list to the sender. */
2835   if (!set_mask) {
2836     unsigned char m[4];
2837     SILC_PUT32_MSB(channel->mode, m);
2838     if (channel->founder_key)
2839       fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
2840     if (channel->channel_pubkeys)
2841       chpklist = silc_server_get_channel_pk_list(server, channel,
2842                                                  FALSE, FALSE);
2843     packet =
2844       silc_command_reply_payload_encode_va(SILC_COMMAND_CMODE,
2845                                            SILC_STATUS_OK, 0, ident, 4,
2846                                            2, tmp_id, tmp_len2,
2847                                            3, m, sizeof(m),
2848                                            4, fkey ? fkey->data : NULL,
2849                                            fkey ? fkey->len : 0,
2850                                            5, chpklist ? chpklist->data : NULL,
2851                                            chpklist ? chpklist->len : 0);
2852     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
2853                             packet->data, packet->len, FALSE);
2854     silc_buffer_free(packet);
2855     goto out;
2856   }
2857
2858   /*
2859    * Check the modes. Modes that requires nothing special operation are
2860    * not checked here.
2861    */
2862
2863   if (mode_mask & SILC_CHANNEL_MODE_PRIVKEY) {
2864     /* Channel uses private keys to protect traffic. Client(s) has set the
2865        key locally they want to use, server does not know that key. */
2866     /* Nothing interesting to do here */
2867   } else {
2868     if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
2869       /* The mode is removed and we need to generate and distribute
2870          new channel key. Clients are not using private channel keys
2871          anymore after this. */
2872
2873       /* Re-generate channel key */
2874       if (!silc_server_create_channel_key(server, channel, 0))
2875         goto out;
2876
2877       /* Send the channel key. This sends it to our local clients and if
2878          we are normal server to our router as well. */
2879       silc_server_send_channel_key(server, NULL, channel,
2880                                    server->server_type == SILC_ROUTER ?
2881                                    FALSE : !server->standalone);
2882
2883       cipher = (char *)silc_cipher_get_name(channel->channel_key);
2884       hmac = (char *)silc_hmac_get_name(channel->hmac);
2885     }
2886   }
2887
2888   if (mode_mask & SILC_CHANNEL_MODE_ULIMIT) {
2889     /* User limit is set on channel */
2890     SilcUInt32 user_limit;
2891
2892     /* Get user limit */
2893     tmp = silc_argument_get_arg_type(cmd->args, 3, NULL);
2894     if (!tmp) {
2895       if (!(channel->mode & SILC_CHANNEL_MODE_ULIMIT)) {
2896         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
2897                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS, 0);
2898         goto out;
2899       }
2900     } else {
2901       SILC_GET32_MSB(user_limit, tmp);
2902       channel->user_limit = user_limit;
2903     }
2904   } else {
2905     if (channel->mode & SILC_CHANNEL_MODE_ULIMIT)
2906       /* User limit mode is unset. Remove user limit */
2907       channel->user_limit = 0;
2908   }
2909
2910   if (mode_mask & SILC_CHANNEL_MODE_PASSPHRASE) {
2911     if (!(channel->mode & SILC_CHANNEL_MODE_PASSPHRASE)) {
2912       /* Passphrase has been set to channel */
2913
2914       /* Get the passphrase */
2915       tmp = silc_argument_get_arg_type(cmd->args, 4, NULL);
2916       if (!tmp) {
2917         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
2918                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS, 0);
2919         goto out;
2920       }
2921
2922       /* Save the passphrase */
2923       passphrase = channel->passphrase = silc_memdup(tmp, strlen(tmp));
2924     }
2925   } else {
2926     if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
2927       /* Passphrase mode is unset. remove the passphrase */
2928       silc_free(channel->passphrase);
2929       channel->passphrase = NULL;
2930     }
2931   }
2932
2933   if (mode_mask & SILC_CHANNEL_MODE_CIPHER) {
2934     if (!(channel->mode & SILC_CHANNEL_MODE_CIPHER)) {
2935       /* Cipher to use protect the traffic */
2936       SilcCipher newkey, oldkey;
2937
2938       /* Get cipher */
2939       cipher = silc_argument_get_arg_type(cmd->args, 5, NULL);
2940       if (!cipher) {
2941         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
2942                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS, 0);
2943         goto out;
2944       }
2945
2946       /* Delete old cipher and allocate the new one */
2947       if (!silc_cipher_alloc(cipher, &newkey)) {
2948         silc_server_command_send_status_data(
2949                                          cmd, SILC_COMMAND_CMODE,
2950                                          SILC_STATUS_ERR_UNKNOWN_ALGORITHM, 0,
2951                                          2, cipher, strlen(cipher));
2952         goto out;
2953       }
2954
2955       oldkey = channel->channel_key;
2956       channel->channel_key = newkey;
2957
2958       /* Re-generate channel key */
2959       if (!silc_server_create_channel_key(server, channel, 0)) {
2960         /* We don't have new key, revert to old one */
2961         channel->channel_key = oldkey;
2962         goto out;
2963       }
2964
2965       /* Remove old channel key for good */
2966       silc_cipher_free(oldkey);
2967
2968       /* Send the channel key. This sends it to our local clients and if
2969          we are normal server to our router as well. */
2970       silc_server_send_channel_key(server, NULL, channel,
2971                                    server->server_type == SILC_ROUTER ?
2972                                    FALSE : !server->standalone);
2973     }
2974   } else {
2975     if (channel->mode & SILC_CHANNEL_MODE_CIPHER) {
2976       /* Cipher mode is unset. Remove the cipher and revert back to
2977          default cipher */
2978       SilcCipher newkey, oldkey;
2979       cipher = channel->cipher;
2980
2981       /* Delete old cipher and allocate default one */
2982       if (!silc_cipher_alloc(cipher ? cipher : SILC_DEFAULT_CIPHER, &newkey)) {
2983         silc_server_command_send_status_data(
2984                                       cmd, SILC_COMMAND_CMODE,
2985                                       SILC_STATUS_ERR_UNKNOWN_ALGORITHM, 0,
2986                                       2, cipher, strlen(cipher));
2987         goto out;
2988       }
2989
2990       oldkey = channel->channel_key;
2991       channel->channel_key = newkey;
2992
2993       /* Re-generate channel key */
2994       if (!silc_server_create_channel_key(server, channel, 0)) {
2995         /* We don't have new key, revert to old one */
2996         channel->channel_key = oldkey;
2997         goto out;
2998       }
2999
3000       /* Remove old channel key for good */
3001       silc_cipher_free(oldkey);
3002
3003       /* Send the channel key. This sends it to our local clients and if
3004          we are normal server to our router as well. */
3005       silc_server_send_channel_key(server, NULL, channel,
3006                                    server->server_type == SILC_ROUTER ?
3007                                    FALSE : !server->standalone);
3008     }
3009   }
3010
3011   if (mode_mask & SILC_CHANNEL_MODE_HMAC) {
3012     if (!(channel->mode & SILC_CHANNEL_MODE_HMAC)) {
3013       /* HMAC to use protect the traffic */
3014       unsigned char hash[32];
3015       SilcHmac newhmac;
3016
3017       /* Get hmac */
3018       hmac = silc_argument_get_arg_type(cmd->args, 6, NULL);
3019       if (!hmac) {
3020         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3021                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS, 0);
3022         goto out;
3023       }
3024
3025       /* Delete old hmac and allocate the new one */
3026       if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3027         silc_server_command_send_status_data(
3028                                         cmd, SILC_COMMAND_CMODE,
3029                                         SILC_STATUS_ERR_UNKNOWN_ALGORITHM, 0,
3030                                         2, hmac, strlen(hmac));
3031         goto out;
3032       }
3033
3034       silc_hmac_free(channel->hmac);
3035       channel->hmac = newhmac;
3036
3037       /* Set the HMAC key out of current channel key. The client must do
3038          this locally. */
3039       silc_hash_make(silc_hmac_get_hash(channel->hmac), channel->key,
3040                      channel->key_len / 8, hash);
3041       silc_hmac_set_key(channel->hmac, hash,
3042                         silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3043       memset(hash, 0, sizeof(hash));
3044     }
3045   } else {
3046     if (channel->mode & SILC_CHANNEL_MODE_HMAC) {
3047       /* Hmac mode is unset. Remove the hmac and revert back to
3048          default hmac */
3049       SilcHmac newhmac;
3050       unsigned char hash[32];
3051       hmac = channel->hmac_name;
3052
3053       /* Delete old hmac and allocate default one */
3054       if (!silc_hmac_alloc(hmac ? hmac : SILC_DEFAULT_HMAC, NULL, &newhmac)) {
3055         silc_server_command_send_status_data(
3056                                         cmd, SILC_COMMAND_CMODE,
3057                                         SILC_STATUS_ERR_UNKNOWN_ALGORITHM, 0,
3058                                         2, hmac, strlen(hmac));
3059         goto out;
3060       }
3061
3062       silc_hmac_free(channel->hmac);
3063       channel->hmac = newhmac;
3064
3065       /* Set the HMAC key out of current channel key. The client must do
3066          this locally. */
3067       silc_hash_make(silc_hmac_get_hash(channel->hmac), channel->key,
3068                      channel->key_len / 8,
3069                      hash);
3070       silc_hmac_set_key(channel->hmac, hash,
3071                         silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3072       memset(hash, 0, sizeof(hash));
3073     }
3074   }
3075
3076   if (mode_mask & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3077     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3078       /* Check if the founder public key was received */
3079       founder_key = idata->public_key;
3080       tmp = silc_argument_get_arg_type(cmd->args, 8, &tmp_len);
3081       if (tmp) {
3082         if (!silc_pkcs_public_key_payload_decode(tmp, tmp_len, &founder_key)) {
3083           silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3084                                                 SILC_STATUS_ERR_AUTH_FAILED,
3085                                                 0);
3086           goto out;
3087         }
3088       } else {
3089         /* If key was not sent and the channel mode has already founder
3090            then the key was not to be changed. */
3091         if (channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH)
3092           goto has_founder;
3093       }
3094
3095       /* Set the founder authentication */
3096       tmp = silc_argument_get_arg_type(cmd->args, 7, &tmp_len);
3097       if (!tmp) {
3098         silc_server_command_send_status_reply(
3099                                      cmd, SILC_COMMAND_CMODE,
3100                                      SILC_STATUS_ERR_NOT_ENOUGH_PARAMS, 0);
3101         goto out;
3102       }
3103
3104       /* Verify the payload before setting the mode */
3105       if (!silc_auth_verify_data(tmp, tmp_len, SILC_AUTH_PUBLIC_KEY,
3106                                  founder_key, 0, server->sha1hash,
3107                                  client->id, SILC_ID_CLIENT)) {
3108         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3109                                               SILC_STATUS_ERR_AUTH_FAILED,
3110                                               0);
3111         goto out;
3112       }
3113
3114       /* Save the public key */
3115       if (channel->founder_key)
3116         silc_pkcs_public_key_free(channel->founder_key);
3117       if (silc_argument_get_arg_type(cmd->args, 8, NULL))
3118         channel->founder_key = founder_key;
3119       else
3120         channel->founder_key = silc_pkcs_public_key_copy(founder_key);
3121       if (!channel->founder_key) {
3122         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3123                                               SILC_STATUS_ERR_AUTH_FAILED,
3124                                               0);
3125         goto out;
3126       }
3127
3128       fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
3129       if (!fkey) {
3130         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3131                                               SILC_STATUS_ERR_AUTH_FAILED,
3132                                               0);
3133         silc_pkcs_public_key_free(channel->founder_key);
3134         channel->founder_key = NULL;
3135         goto out;
3136       }
3137     }
3138   } else {
3139     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3140       if (channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3141         if (channel->founder_key)
3142           silc_pkcs_public_key_free(channel->founder_key);
3143         channel->founder_key = NULL;
3144       }
3145     }
3146   }
3147  has_founder:
3148
3149   if (mode_mask & SILC_CHANNEL_MODE_CHANNEL_AUTH) {
3150     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3151       SilcStatus st;
3152
3153       chpkdata = silc_argument_get_arg_type(cmd->args, 9, &chpklen);
3154
3155       if (!chpkdata && channel->mode & SILC_CHANNEL_MODE_CHANNEL_AUTH)
3156         goto has_pk_list;
3157
3158       set_chpk = TRUE;
3159
3160       /* Process the channel public key(s) */
3161       st = silc_server_set_channel_pk_list(server, NULL, channel,
3162                                            chpkdata, chpklen);
3163       if (st != SILC_STATUS_OK) {
3164         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, st, 0);
3165         goto out;
3166       }
3167     }
3168   } else {
3169     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3170       if (channel->mode & SILC_CHANNEL_MODE_CHANNEL_AUTH) {
3171         if (channel->channel_pubkeys)
3172           silc_hash_table_free(channel->channel_pubkeys);
3173         channel->channel_pubkeys = NULL;
3174         set_chpk = TRUE;
3175       }
3176     }
3177   }
3178  has_pk_list:
3179
3180   /* Finally, set the mode */
3181   old_mask = channel->mode = mode_mask;
3182
3183   /* Send CMODE_CHANGE notify. */
3184   cidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3185   silc_server_send_notify_to_channel(server, NULL, channel, FALSE, TRUE,
3186                                      SILC_NOTIFY_TYPE_CMODE_CHANGE, 7,
3187                                      cidp->data, cidp->len,
3188                                      tmp_mask, 4,
3189                                      cipher, cipher ? strlen(cipher) : 0,
3190                                      hmac, hmac ? strlen(hmac) : 0,
3191                                      passphrase, passphrase ?
3192                                      strlen(passphrase) : 0,
3193                                      fkey ? fkey->data : NULL,
3194                                      fkey ? fkey->len : 0,
3195                                      chpkdata ? chpkdata : NULL,
3196                                      chpkdata ? chpklen : 0);
3197
3198   /* Set CMODE notify type to network */
3199   if (chpkdata && chpklen)
3200     silc_buffer_set(&chpk, chpkdata, chpklen);
3201   silc_server_send_notify_cmode(server, SILC_PRIMARY_ROUTE(server),
3202                                 SILC_BROADCAST(server), channel,
3203                                 mode_mask, client->id, SILC_ID_CLIENT,
3204                                 cipher, hmac, passphrase, founder_key,
3205                                 chpkdata ? &chpk : NULL);
3206
3207   if (set_chpk)
3208     chpklist = silc_server_get_channel_pk_list(server, channel, FALSE, FALSE);
3209
3210   /* Send command reply to sender */
3211   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CMODE,
3212                                                 SILC_STATUS_OK, 0, ident, 4,
3213                                                 2, tmp_id, tmp_len2,
3214                                                 3, tmp_mask, 4,
3215                                                 4, fkey ? fkey->data : NULL,
3216                                                 fkey ? fkey->len : 0,
3217                                                 5, chpklist ? chpklist->data :
3218                                                 NULL, chpklist ? chpklist->len
3219                                                 : 0);
3220   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3221                           packet->data, packet->len, FALSE);
3222
3223   silc_buffer_free(packet);
3224   silc_buffer_free(cidp);
3225
3226  out:
3227   channel->mode = old_mask;
3228   silc_buffer_free(chpklist);
3229   silc_buffer_free(fkey);
3230   silc_free(channel_id);
3231   silc_server_command_free(cmd);
3232 }
3233
3234 /* Server side of CUMODE command. Changes client's mode on a channel. */
3235
3236 SILC_SERVER_CMD_FUNC(cumode)
3237 {
3238   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3239   SilcServer server = cmd->server;
3240   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3241   SilcChannelID *channel_id = NULL;
3242   SilcClientID *client_id = NULL;
3243   SilcChannelEntry channel;
3244   SilcClientEntry target_client;
3245   SilcChannelClientEntry chl;
3246   SilcBuffer packet, idp;
3247   unsigned char *tmp_id, *tmp_ch_id, *tmp_mask;
3248   SilcUInt32 target_mask, sender_mask = 0, tmp_len, tmp_ch_len;
3249   int notify = FALSE;
3250   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
3251   SilcPublicKey founder_key = NULL;
3252   SilcBuffer fkey = NULL;
3253
3254   if (!client)
3255     goto out;
3256
3257   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CUMODE, cmd, 3, 4);
3258
3259   /* Get Channel ID */
3260   tmp_ch_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_ch_len);
3261   if (!tmp_ch_id) {
3262     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3263                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
3264     goto out;
3265   }
3266   channel_id = silc_id_payload_parse_id(tmp_ch_id, tmp_ch_len, NULL);
3267   if (!channel_id) {
3268     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3269                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
3270     goto out;
3271   }
3272
3273   /* Get channel entry */
3274   channel = silc_idlist_find_channel_by_id(server->local_list,
3275                                            channel_id, NULL);
3276   if (!channel) {
3277     channel = silc_idlist_find_channel_by_id(server->global_list,
3278                                              channel_id, NULL);
3279     if (!channel) {
3280       silc_server_command_send_status_data(cmd, SILC_COMMAND_CUMODE,
3281                                            SILC_STATUS_ERR_NO_SUCH_CHANNEL_ID,
3282                                            0, 2, tmp_ch_id, tmp_ch_len);
3283       goto out;
3284     }
3285   }
3286
3287   /* Check whether sender is on the channel */
3288   if (!silc_server_client_on_channel(client, channel, &chl)) {
3289     silc_server_command_send_status_data(cmd, SILC_COMMAND_CUMODE,
3290                                          SILC_STATUS_ERR_NOT_ON_CHANNEL, 0,
3291                                          2, tmp_ch_id, tmp_ch_len);
3292     goto out;
3293   }
3294   sender_mask = chl->mode;
3295
3296   /* Get the target client's channel mode mask */
3297   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL);
3298   if (!tmp_mask) {
3299     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3300                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
3301                                           0);
3302     goto out;
3303   }
3304   SILC_GET32_MSB(target_mask, tmp_mask);
3305
3306   /* Get target Client ID */
3307   tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
3308   if (!tmp_id) {
3309     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3310                                           SILC_STATUS_ERR_NO_CLIENT_ID, 0);
3311     goto out;
3312   }
3313   client_id = silc_id_payload_parse_id(tmp_id, tmp_len, NULL);
3314   if (!client_id) {
3315     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3316                                           SILC_STATUS_ERR_NO_CLIENT_ID, 0);
3317     goto out;
3318   }
3319
3320   /* Get target client's entry */
3321   target_client = silc_idlist_find_client_by_id(server->local_list,
3322                                                 client_id, TRUE, NULL);
3323   if (!target_client) {
3324     target_client = silc_idlist_find_client_by_id(server->global_list,
3325                                                   client_id, TRUE, NULL);
3326   }
3327
3328   if (target_client != client &&
3329       !(sender_mask & SILC_CHANNEL_UMODE_CHANFO) &&
3330       !(sender_mask & SILC_CHANNEL_UMODE_CHANOP)) {
3331     silc_server_command_send_status_data(cmd, SILC_COMMAND_CUMODE,
3332                                          SILC_STATUS_ERR_NO_CHANNEL_PRIV, 0,
3333                                          2, tmp_ch_id, tmp_ch_len);
3334     goto out;
3335   }
3336
3337   /* Check whether target client is on the channel */
3338   if (target_client != client) {
3339     if (!silc_server_client_on_channel(target_client, channel, &chl)) {
3340       silc_server_command_send_status_data2(
3341                                   cmd, SILC_COMMAND_CUMODE,
3342                                   SILC_STATUS_ERR_USER_NOT_ON_CHANNEL, 0,
3343                                   2, tmp_id, tmp_len,
3344                                   3, tmp_ch_id, tmp_ch_len);
3345       goto out;
3346     }
3347   }
3348
3349   /*
3350    * Change the mode
3351    */
3352
3353   /* If the target client is founder, no one else can change their mode
3354      but themselves. */
3355   if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && client != target_client) {
3356     silc_server_command_send_status_data(cmd, SILC_COMMAND_CUMODE,
3357                                          SILC_STATUS_ERR_NO_CHANNEL_FOPRIV,
3358                                          0, 2, tmp_ch_id, tmp_ch_len);
3359     goto out;
3360   }
3361
3362   if (target_mask & SILC_CHANNEL_UMODE_CHANFO) {
3363     if (target_client != client) {
3364       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3365                                             SILC_STATUS_ERR_NOT_YOU, 0);
3366       goto out;
3367     }
3368
3369     if (!(chl->mode & SILC_CHANNEL_UMODE_CHANFO)) {
3370       /* The client tries to claim the founder rights. */
3371       unsigned char *tmp_auth;
3372       SilcUInt32 tmp_auth_len;
3373       SilcChannelClientEntry chl2;
3374       SilcHashTableList htl;
3375
3376       if (!(channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) ||
3377           !channel->founder_key) {
3378         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3379                                               SILC_STATUS_ERR_AUTH_FAILED, 0);
3380         goto out;
3381       }
3382
3383       tmp_auth = silc_argument_get_arg_type(cmd->args, 4, &tmp_auth_len);
3384       if (!tmp_auth) {
3385         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3386                                               SILC_STATUS_ERR_AUTH_FAILED, 0);
3387         goto out;
3388       }
3389
3390       /* Verify the authentication payload */
3391       if (!silc_auth_verify_data(tmp_auth, tmp_auth_len, SILC_AUTH_PUBLIC_KEY,
3392                                  channel->founder_key, 0, server->sha1hash,
3393                                  client->id, SILC_ID_CLIENT)) {
3394         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3395                                               SILC_STATUS_ERR_AUTH_FAILED, 0);
3396         goto out;
3397       }
3398
3399       notify = TRUE;
3400       founder_key = channel->founder_key;
3401       fkey = silc_pkcs_public_key_payload_encode(founder_key);
3402       if (!fkey) {
3403         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3404                                               SILC_STATUS_ERR_AUTH_FAILED, 0);
3405         goto out;
3406       }
3407
3408       /* There cannot be anyone else as founder on the channel now.  This
3409          client is definitely the founder due to this authentication */
3410       silc_hash_table_list(channel->user_list, &htl);
3411       while (silc_hash_table_get(&htl, NULL, (void *)&chl2))
3412         if (chl2->mode & SILC_CHANNEL_UMODE_CHANFO) {
3413           chl2->mode &= ~SILC_CHANNEL_UMODE_CHANFO;
3414           silc_server_force_cumode_change(server, NULL, channel, chl2,
3415                                           chl2->mode);
3416           break;
3417         }
3418       silc_hash_table_list_reset(&htl);
3419
3420       sender_mask = chl->mode |= SILC_CHANNEL_UMODE_CHANFO;
3421     }
3422   } else {
3423     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3424       if (target_client == client) {
3425         /* Remove channel founder rights from itself */
3426         chl->mode &= ~SILC_CHANNEL_UMODE_CHANFO;
3427         notify = TRUE;
3428       } else {
3429         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3430                                               SILC_STATUS_ERR_NOT_YOU, 0);
3431         goto out;
3432       }
3433     }
3434   }
3435
3436   if (target_mask & SILC_CHANNEL_UMODE_CHANOP) {
3437     /* Promote to operator */
3438     if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) {
3439       if (!(sender_mask & SILC_CHANNEL_UMODE_CHANOP) &&
3440           !(sender_mask & SILC_CHANNEL_UMODE_CHANFO)) {
3441         silc_server_command_send_status_data(cmd, SILC_COMMAND_CUMODE,
3442                                              SILC_STATUS_ERR_NO_CHANNEL_PRIV,
3443                                              0, 2, tmp_ch_id, tmp_ch_len);
3444         goto out;
3445       }
3446
3447       chl->mode |= SILC_CHANNEL_UMODE_CHANOP;
3448       notify = TRUE;
3449     }
3450   } else {
3451     if (chl->mode & SILC_CHANNEL_UMODE_CHANOP) {
3452       if (!(sender_mask & SILC_CHANNEL_UMODE_CHANOP) &&
3453           !(sender_mask & SILC_CHANNEL_UMODE_CHANFO)) {
3454         silc_server_command_send_status_data(cmd, SILC_COMMAND_CUMODE,
3455                                              SILC_STATUS_ERR_NO_CHANNEL_PRIV,
3456                                              0, 2, tmp_ch_id, tmp_ch_len);
3457         goto out;
3458       }
3459
3460       /* Demote to normal user */
3461       chl->mode &= ~SILC_CHANNEL_UMODE_CHANOP;
3462       notify = TRUE;
3463     }
3464   }
3465
3466   if (target_mask & SILC_CHANNEL_UMODE_BLOCK_MESSAGES) {
3467     if (target_client != client) {
3468       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3469                                             SILC_STATUS_ERR_NOT_YOU, 0);
3470       goto out;
3471     }
3472
3473     if (!(chl->mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES)) {
3474       chl->mode |= SILC_CHANNEL_UMODE_BLOCK_MESSAGES;
3475       notify = TRUE;
3476     }
3477   } else {
3478     if (chl->mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES) {
3479       if (target_client != client) {
3480         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3481                                               SILC_STATUS_ERR_NOT_YOU, 0);
3482         goto out;
3483       }
3484
3485       chl->mode &= ~SILC_CHANNEL_UMODE_BLOCK_MESSAGES;
3486       notify = TRUE;
3487     }
3488   }
3489
3490   if (target_mask & SILC_CHANNEL_UMODE_BLOCK_MESSAGES_USERS) {
3491     if (target_client != client) {
3492       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3493                                             SILC_STATUS_ERR_NOT_YOU, 0);
3494       goto out;
3495     }
3496
3497     if (!(chl->mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES_USERS)) {
3498       chl->mode |= SILC_CHANNEL_UMODE_BLOCK_MESSAGES_USERS;
3499       notify = TRUE;
3500     }
3501   } else {
3502     if (chl->mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES_USERS) {
3503       if (target_client != client) {
3504         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3505                                               SILC_STATUS_ERR_NOT_YOU, 0);
3506         goto out;
3507       }
3508
3509       chl->mode &= ~SILC_CHANNEL_UMODE_BLOCK_MESSAGES_USERS;
3510       notify = TRUE;
3511     }
3512   }
3513
3514   if (target_mask & SILC_CHANNEL_UMODE_BLOCK_MESSAGES_ROBOTS) {
3515     if (target_client != client) {
3516       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3517                                             SILC_STATUS_ERR_NOT_YOU, 0);
3518       goto out;
3519     }
3520
3521     if (!(chl->mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES_ROBOTS)) {
3522       chl->mode |= SILC_CHANNEL_UMODE_BLOCK_MESSAGES_ROBOTS;
3523       notify = TRUE;
3524     }
3525   } else {
3526     if (chl->mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES_ROBOTS) {
3527       if (target_client != client) {
3528         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3529                                               SILC_STATUS_ERR_NOT_YOU, 0);
3530         goto out;
3531       }
3532
3533       chl->mode &= ~SILC_CHANNEL_UMODE_BLOCK_MESSAGES_ROBOTS;
3534       notify = TRUE;
3535     }
3536   }
3537
3538   if (target_mask & SILC_CHANNEL_UMODE_QUIET) {
3539     if (!(chl->mode & SILC_CHANNEL_UMODE_QUIET)) {
3540       if (client == target_client) {
3541         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3542                                               SILC_STATUS_ERR_PERM_DENIED, 0);
3543         goto out;
3544       }
3545       chl->mode |= SILC_CHANNEL_UMODE_QUIET;
3546       notify = TRUE;
3547     }
3548   } else {
3549     if (chl->mode & SILC_CHANNEL_UMODE_QUIET) {
3550       if (client == target_client) {
3551         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3552                                               SILC_STATUS_ERR_PERM_DENIED, 0);
3553         goto out;
3554       }
3555       chl->mode &= ~SILC_CHANNEL_UMODE_QUIET;
3556       notify = TRUE;
3557     }
3558   }
3559
3560   idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3561   tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
3562
3563   /* Send notify to channel, notify only if mode was actually changed. */
3564   if (notify) {
3565     silc_server_send_notify_to_channel(server, NULL, channel, FALSE, TRUE,
3566                                        SILC_NOTIFY_TYPE_CUMODE_CHANGE, 4,
3567                                        idp->data, idp->len,
3568                                        tmp_mask, 4,
3569                                        tmp_id, tmp_len,
3570                                        fkey ? fkey->data : NULL,
3571                                        fkey ? fkey->len : 0);
3572
3573     /* Set CUMODE notify type to network */
3574     silc_server_send_notify_cumode(server, SILC_PRIMARY_ROUTE(server),
3575                                    SILC_BROADCAST(server), channel,
3576                                    target_mask, client->id, SILC_ID_CLIENT,
3577                                    target_client->id, founder_key);
3578   }
3579
3580   /* Send command reply to sender */
3581   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CUMODE,
3582                                                 SILC_STATUS_OK, 0, ident, 3,
3583                                                 2, tmp_mask, 4,
3584                                                 3, tmp_ch_id, tmp_ch_len,
3585                                                 4, tmp_id, tmp_len);
3586   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3587                           packet->data, packet->len, FALSE);
3588
3589   silc_buffer_free(packet);
3590   silc_buffer_free(idp);
3591
3592  out:
3593   silc_free(channel_id);
3594   silc_free(client_id);
3595   silc_buffer_free(fkey);
3596   silc_server_command_free(cmd);
3597 }
3598
3599 /* Server side of KICK command. Kicks client out of channel. */
3600
3601 SILC_SERVER_CMD_FUNC(kick)
3602 {
3603   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3604   SilcServer server = cmd->server;
3605   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3606   SilcClientEntry target_client;
3607   SilcChannelID *channel_id;
3608   SilcClientID *client_id;
3609   SilcChannelEntry channel;
3610   SilcChannelClientEntry chl;
3611   SilcBuffer idp, packet;
3612   SilcUInt32 tmp_len, target_idp_len, clen;
3613   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
3614   unsigned char *tmp, *comment, *target_idp;
3615
3616   if (!client)
3617     goto out;
3618
3619   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_LEAVE, cmd, 1, 3);
3620
3621   /* Get Channel ID */
3622   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
3623   if (!tmp) {
3624     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
3625                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
3626     goto out;
3627   }
3628   channel_id = silc_id_payload_parse_id(tmp, tmp_len, NULL);
3629   if (!channel_id) {
3630     silc_server_command_send_status_data(cmd, SILC_COMMAND_KICK,
3631                                          SILC_STATUS_ERR_BAD_CHANNEL_ID, 0,
3632                                          2, tmp, tmp_len);
3633     goto out;
3634   }
3635
3636   /* Get channel entry */
3637   channel = silc_idlist_find_channel_by_id(server->local_list,
3638                                            channel_id, NULL);
3639   if (!channel) {
3640     channel = silc_idlist_find_channel_by_id(server->local_list,
3641                                              channel_id, NULL);
3642     if (!channel) {
3643       silc_server_command_send_status_data(cmd, SILC_COMMAND_KICK,
3644                                            SILC_STATUS_ERR_NO_SUCH_CHANNEL_ID,
3645                                            0, 2, tmp, tmp_len);
3646       goto out;
3647     }
3648   }
3649
3650   /* Check whether sender is on the channel */
3651   if (!silc_server_client_on_channel(client, channel, &chl)) {
3652     silc_server_command_send_status_data(cmd, SILC_COMMAND_KICK,
3653                                          SILC_STATUS_ERR_NOT_ON_CHANNEL,
3654                                          0, 2, tmp, tmp_len);
3655     goto out;
3656   }
3657
3658   /* Check that the kicker is channel operator or channel founder */
3659   if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP) &&
3660       !(chl->mode & SILC_CHANNEL_UMODE_CHANFO)) {
3661     silc_server_command_send_status_data(cmd, SILC_COMMAND_KICK,
3662                                          SILC_STATUS_ERR_NO_CHANNEL_PRIV,
3663                                          0, 2, tmp, tmp_len);
3664     goto out;
3665   }
3666
3667   /* Get target Client ID */
3668   target_idp = silc_argument_get_arg_type(cmd->args, 2, &target_idp_len);
3669   if (!target_idp) {
3670     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
3671                                           SILC_STATUS_ERR_NO_CLIENT_ID, 0);
3672     goto out;
3673   }
3674   client_id = silc_id_payload_parse_id(target_idp, target_idp_len, NULL);
3675   if (!client_id) {
3676     silc_server_command_send_status_data(cmd, SILC_COMMAND_KICK,
3677                                          SILC_STATUS_ERR_BAD_CLIENT_ID,
3678                                          0, 2, target_idp, target_idp_len);
3679     goto out;
3680   }
3681
3682   /* Get target client's entry */
3683   target_client = silc_idlist_find_client_by_id(server->local_list,
3684                                                 client_id, TRUE, NULL);
3685   if (!target_client) {
3686     target_client = silc_idlist_find_client_by_id(server->global_list,
3687                                                   client_id, TRUE, NULL);
3688   }
3689
3690   /* Check whether target client is on the channel */
3691   if (!silc_server_client_on_channel(target_client, channel, &chl)) {
3692     silc_server_command_send_status_data2(cmd, SILC_COMMAND_KICK,
3693                                           SILC_STATUS_ERR_USER_NOT_ON_CHANNEL,
3694                                           0, 2, target_idp, target_idp_len,
3695                                           3, tmp, tmp_len);
3696     goto out;
3697   }
3698
3699   /* Check that the target client is not channel founder. Channel founder
3700      cannot be kicked from the channel. */
3701   if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3702     silc_server_command_send_status_data(cmd, SILC_COMMAND_KICK,
3703                                          SILC_STATUS_ERR_NO_CHANNEL_FOPRIV,
3704                                          0, 2, tmp, tmp_len);
3705     goto out;
3706   }
3707
3708   /* Get comment */
3709   comment = silc_argument_get_arg_type(cmd->args, 3, &clen);
3710   if (clen > 128)
3711     comment = NULL;
3712
3713
3714   /* Send the reply back to the client */
3715   packet =
3716     silc_command_reply_payload_encode_va(SILC_COMMAND_KICK,
3717                                          SILC_STATUS_OK, 0, ident, 2,
3718                                          2, tmp, tmp_len,
3719                                          3, target_idp, target_idp_len);
3720   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3721                           packet->data, packet->len, FALSE);
3722   silc_buffer_free(packet);
3723
3724   /* Send KICKED notify to local clients on the channel */
3725   idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3726   silc_server_send_notify_to_channel(server, NULL, channel, FALSE, TRUE,
3727                                      SILC_NOTIFY_TYPE_KICKED, 3,
3728                                      target_idp, target_idp_len,
3729                                      comment, comment ? strlen(comment) : 0,
3730                                      idp->data, idp->len);
3731   silc_buffer_free(idp);
3732
3733   /* Send KICKED notify to primary route */
3734   silc_server_send_notify_kicked(server, SILC_PRIMARY_ROUTE(server),
3735                                  SILC_BROADCAST(server), channel,
3736                                  target_client->id, client->id, comment);
3737
3738   /* Remove the client from channel's invite list */
3739   if (channel->invite_list && silc_hash_table_count(channel->invite_list)) {
3740     SilcBuffer ab =
3741       silc_argument_payload_encode_one(NULL, target_idp, target_idp_len, 3);
3742     SilcArgumentPayload args =
3743       silc_argument_payload_parse(ab->data, ab->len, 1);
3744     silc_server_inviteban_process(server, channel->invite_list, 1, args);
3745     silc_buffer_free(ab);
3746     silc_argument_payload_free(args);
3747   }
3748
3749   /* Remove the client from the channel. If the channel does not exist
3750      after removing the client then the client kicked itself off the channel
3751      and we don't have to send anything after that. */
3752   if (!silc_server_remove_from_one_channel(server, NULL, channel,
3753                                            target_client, FALSE))
3754     goto out;
3755
3756   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
3757     /* Re-generate channel key */
3758     if (!silc_server_create_channel_key(server, channel, 0))
3759       goto out;
3760
3761     /* Send the channel key to the channel. The key of course is not sent
3762        to the client who was kicked off the channel. */
3763     silc_server_send_channel_key(server, target_client->connection, channel,
3764                                  server->server_type == SILC_ROUTER ?
3765                                  FALSE : !server->standalone);
3766   }
3767
3768  out:
3769   silc_server_command_free(cmd);
3770 }
3771
3772 /* Server side of OPER command. Client uses this comand to obtain server
3773    operator privileges to this server/router. */
3774
3775 SILC_SERVER_CMD_FUNC(oper)
3776 {
3777   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3778   SilcServer server = cmd->server;
3779   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3780   unsigned char *username, *auth;
3781   SilcUInt32 tmp_len;
3782   SilcServerConfigAdmin *admin;
3783   SilcIDListData idata = (SilcIDListData)client;
3784   bool result = FALSE;
3785   SilcPublicKey cached_key;
3786
3787   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
3788     goto out;
3789
3790   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_OPER, cmd, 1, 2);
3791
3792   /* Get the username */
3793   username = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
3794   if (!username) {
3795     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
3796                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
3797                                           0);
3798     goto out;
3799   }
3800
3801   /* Get the admin configuration */
3802   admin = silc_server_config_find_admin(server, cmd->sock->ip,
3803                                         username, client->nickname);
3804   if (!admin) {
3805     admin = silc_server_config_find_admin(server, cmd->sock->hostname,
3806                                           username, client->nickname);
3807     if (!admin) {
3808       silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
3809                                             SILC_STATUS_ERR_AUTH_FAILED,
3810                                             0);
3811       SILC_LOG_INFO(("OPER authentication failed for username '%s' by "
3812                      "nickname '%s' from %s", username,
3813                      client->nickname, cmd->sock->hostname));
3814       goto out;
3815     }
3816   }
3817
3818   /* Get the authentication payload */
3819   auth = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
3820   if (!auth) {
3821     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
3822                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
3823                                           0);
3824     goto out;
3825   }
3826
3827   /* Verify the authentication data. If both passphrase and public key
3828      is set then try both of them. */
3829   if (admin->passphrase)
3830     result = silc_auth_verify_data(auth, tmp_len, SILC_AUTH_PASSWORD,
3831                                    admin->passphrase, admin->passphrase_len,
3832                                    idata->hash, client->id, SILC_ID_CLIENT);
3833   if (!result && admin->publickeys) {
3834     cached_key = silc_server_get_public_key(server, admin->publickeys);
3835     if (!cached_key)
3836       goto out;
3837     result = silc_auth_verify_data(auth, tmp_len, SILC_AUTH_PUBLIC_KEY,
3838                                    cached_key, 0, idata->hash,
3839                                    client->id, SILC_ID_CLIENT);
3840   }
3841   if (!result) {
3842     /* Authentication failed */
3843     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
3844                                           SILC_STATUS_ERR_AUTH_FAILED,
3845                                           0);
3846     goto out;
3847   }
3848
3849   /* Client is now server operator */
3850   client->mode |= SILC_UMODE_SERVER_OPERATOR;
3851
3852   /* Update statistics */
3853   if (SILC_IS_LOCAL(client))
3854     server->stat.my_server_ops++;
3855   if (server->server_type == SILC_ROUTER)
3856     server->stat.server_ops++;
3857
3858   /* Send UMODE change to primary router */
3859   silc_server_send_notify_umode(server, SILC_PRIMARY_ROUTE(server),
3860                                 SILC_BROADCAST(server), client->id,
3861                                 client->mode);
3862
3863   /* Check if anyone is watching this nickname */
3864   if (server->server_type == SILC_ROUTER)
3865     silc_server_check_watcher_list(server, client, NULL,
3866                                    SILC_NOTIFY_TYPE_UMODE_CHANGE);
3867
3868   /* Send reply to the sender */
3869   silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
3870                                         SILC_STATUS_OK, 0);
3871
3872  out:
3873   silc_server_command_free(cmd);
3874 }
3875
3876 SILC_TASK_CALLBACK(silc_server_command_detach_cb)
3877 {
3878   SilcServer server = app_context;
3879   QuitInternal q = (QuitInternal)context;
3880   SilcClientID *client_id = (SilcClientID *)q->sock;
3881   SilcClientEntry client;
3882   SilcSocketConnection sock;
3883
3884   client = silc_idlist_find_client_by_id(server->local_list, client_id,
3885                                          TRUE, NULL);
3886   if (client && client->connection) {
3887     sock = client->connection;
3888
3889     /* If there is pending outgoing data for the client then purge it
3890        to the network before closing connection. */
3891     silc_server_packet_queue_purge(server, sock);
3892
3893     /* Close the connection on our side */
3894     client->router = NULL;
3895     client->connection = NULL;
3896     sock->user_data = NULL;
3897     silc_server_close_connection(server, sock);
3898   }
3899
3900   silc_free(client_id);
3901   silc_free(q);
3902 }
3903
3904 SILC_TASK_CALLBACK(silc_server_command_detach_timeout)
3905 {
3906   SilcServer server = app_context;
3907   QuitInternal q = (QuitInternal)context;
3908   SilcClientID *client_id = (SilcClientID *)q->sock;
3909   SilcClientEntry client;
3910
3911   client = silc_idlist_find_client_by_id(server->local_list, client_id,
3912                                          TRUE, NULL);
3913   if (client && client->mode & SILC_UMODE_DETACHED) {
3914     SILC_LOG_DEBUG(("Detach timeout"));
3915     silc_server_free_client_data(server, NULL, client, TRUE,
3916                                  "Detach timeout");
3917   }
3918
3919   silc_free(client_id);
3920   silc_free(q);
3921 }
3922
3923 /* Server side of DETACH command.  Detached the client from the network
3924    by closing the connection but preserving the session. */
3925
3926 SILC_SERVER_CMD_FUNC(detach)
3927 {
3928   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3929   SilcServer server = cmd->server;
3930   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3931   QuitInternal q;
3932
3933   if (server->config->detach_disabled) {
3934     silc_server_command_send_status_reply(cmd, SILC_COMMAND_DETACH,
3935                                           SILC_STATUS_ERR_OPERATION_ALLOWED,
3936                                           0);
3937     goto out;
3938   }
3939
3940   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
3941     goto out;
3942
3943   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_DETACH, cmd, 0, 0);
3944
3945   /* Remove operator privileges, since the client may resume in some
3946      other server which to it does not have operator privileges. */
3947   SILC_OPER_STATS_UPDATE(client, server, SILC_UMODE_SERVER_OPERATOR);
3948   SILC_OPER_STATS_UPDATE(client, router, SILC_UMODE_ROUTER_OPERATOR);
3949
3950   /* Send the user mode notify to notify that client is detached */
3951   client->mode |= SILC_UMODE_DETACHED;
3952   client->data.status &= ~SILC_IDLIST_STATUS_RESUMED;
3953   client->data.status &= ~SILC_IDLIST_STATUS_NOATTR;
3954   client->last_command = 0;
3955   client->fast_command = 0;
3956   silc_server_send_notify_umode(server, SILC_PRIMARY_ROUTE(server),
3957                                 SILC_BROADCAST(server), client->id,
3958                                 client->mode);
3959   server->stat.my_detached++;
3960
3961   /* Check if anyone is watching this nickname */
3962   if (server->server_type == SILC_ROUTER)
3963     silc_server_check_watcher_list(server, client, NULL,
3964                                    SILC_NOTIFY_TYPE_UMODE_CHANGE);
3965
3966   q = silc_calloc(1, sizeof(*q));
3967   q->sock = silc_id_dup(client->id, SILC_ID_CLIENT);
3968   silc_schedule_task_add(server->schedule, 0, silc_server_command_detach_cb,
3969                          q, 0, 200000, SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
3970
3971   if (server->config->detach_timeout) {
3972     q = silc_calloc(1, sizeof(*q));
3973     q->sock = silc_id_dup(client->id, SILC_ID_CLIENT);
3974     silc_schedule_task_add(server->schedule, 0,
3975                            silc_server_command_detach_timeout,
3976                            q, server->config->detach_timeout * 60,
3977                            0, SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
3978   }
3979
3980   /* Send reply to the sender */
3981   silc_server_command_send_status_reply(cmd, SILC_COMMAND_DETACH,
3982                                         SILC_STATUS_OK, 0);
3983
3984  out:
3985   silc_server_command_free(cmd);
3986 }
3987
3988 /* Server side of WATCH command. */
3989
3990 SILC_SERVER_CMD_FUNC(watch)
3991 {
3992   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3993   SilcServer server = cmd->server;
3994   char *add_nick, *del_nick;
3995   SilcUInt32 add_nick_len, del_nick_len, tmp_len;
3996   char nick[128 + 1];
3997   unsigned char hash[16], *tmp;
3998   SilcClientEntry client;
3999   SilcClientID *client_id = NULL;
4000
4001   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_WATCH, cmd, 1, 3);
4002
4003   if (server->server_type != SILC_ROUTER && !server->standalone) {
4004     if (!cmd->pending) {
4005       /* Send the command to router */
4006       SilcBuffer tmpbuf;
4007       SilcUInt16 old_ident;
4008
4009       SILC_LOG_DEBUG(("Forwarding WATCH to router"));
4010
4011       old_ident = silc_command_get_ident(cmd->payload);
4012       silc_command_set_ident(cmd->payload, ++server->cmd_ident);
4013       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4014
4015       silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
4016                               SILC_PACKET_COMMAND, cmd->packet->flags,
4017                               tmpbuf->data, tmpbuf->len, TRUE);
4018
4019       /* Reprocess this packet after received reply from router */
4020       silc_server_command_pending(server, SILC_COMMAND_WATCH,
4021                                   silc_command_get_ident(cmd->payload),
4022                                   silc_server_command_watch,
4023                                   silc_server_command_dup(cmd));
4024       cmd->pending = TRUE;
4025       silc_command_set_ident(cmd->payload, old_ident);
4026       silc_buffer_free(tmpbuf);
4027     } else if (context2) {
4028       /* Received reply from router, just send same data to the client. */
4029       SilcServerCommandReplyContext reply = context2;
4030       SilcStatus status;
4031
4032       SILC_LOG_DEBUG(("Received reply to WATCH from router"));
4033       silc_command_get_status(reply->payload, &status, NULL);
4034       silc_server_command_send_status_reply(cmd, SILC_COMMAND_WATCH, status,
4035                                             0);
4036     }
4037
4038     goto out;
4039   }
4040
4041   /* We are router and keep the watch list for local cell */
4042
4043   /* Get the client ID */
4044   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4045   if (!tmp) {
4046     silc_server_command_send_status_reply(cmd, SILC_COMMAND_WATCH,
4047                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
4048                                           0);
4049     goto out;
4050   }
4051   client_id = silc_id_payload_parse_id(tmp, tmp_len, NULL);
4052   if (!client_id) {
4053     silc_server_command_send_status_data(cmd, SILC_COMMAND_WATCH,
4054                                          SILC_STATUS_ERR_NO_SUCH_CLIENT_ID,
4055                                          0, 2, tmp, tmp_len);
4056     goto out;
4057   }
4058
4059   /* Get the client entry which must be in local list */
4060   client = silc_idlist_find_client_by_id(server->local_list,
4061                                          client_id, TRUE, NULL);
4062   if (!client) {
4063     silc_server_command_send_status_data(cmd, SILC_COMMAND_WATCH,
4064                                          SILC_STATUS_ERR_NO_SUCH_CLIENT_ID, 0,
4065                                          2, tmp, tmp_len);
4066     goto out;
4067   }
4068
4069   /* Take nickname */
4070   add_nick = silc_argument_get_arg_type(cmd->args, 2, &add_nick_len);
4071   del_nick = silc_argument_get_arg_type(cmd->args, 3, &del_nick_len);
4072   if (!add_nick && !del_nick) {
4073     silc_server_command_send_status_reply(cmd, SILC_COMMAND_WATCH,
4074                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
4075                                           0);
4076     goto out;
4077   }
4078
4079   if (add_nick && add_nick_len > 128)
4080     add_nick[128] = '\0';
4081   if (del_nick && del_nick_len > 128)
4082     del_nick[128] = '\0';
4083
4084   memset(nick, 0, sizeof(nick));
4085
4086   /* Add new nickname to be watched in our cell */
4087   if (add_nick) {
4088     if (silc_server_name_bad_chars(add_nick, strlen(add_nick)) == TRUE) {
4089       silc_server_command_send_status_reply(cmd, SILC_COMMAND_WATCH,
4090                                             SILC_STATUS_ERR_BAD_NICKNAME, 0);
4091       goto out;
4092     }
4093
4094     /* Hash the nick, we have the hash saved, not nicks because we can
4095        do one to one mapping to the nick from Client ID hash this way. */
4096     silc_to_lower(add_nick, nick, sizeof(nick) - 1);
4097     silc_hash_make(server->md5hash, nick, strlen(nick), hash);
4098
4099     /* Check whether this client is already watching this nickname */
4100     if (silc_hash_table_find_by_context(server->watcher_list, hash,
4101                                         client, NULL)) {
4102       /* Nickname is alredy being watched for this client */
4103       silc_server_command_send_status_reply(cmd, SILC_COMMAND_WATCH,
4104                                             SILC_STATUS_ERR_NICKNAME_IN_USE,
4105                                             0);
4106       goto out;
4107     }
4108
4109     /* Get the nickname from the watcher list and use the same key in
4110        new entries as well.  If key doesn't exist then create it. */
4111     if (!silc_hash_table_find(server->watcher_list, hash, (void *)&tmp, NULL))
4112       tmp = silc_memdup(hash, CLIENTID_HASH_LEN);
4113
4114     /* Add the client to the watcher list with the specified nickname hash. */
4115     silc_hash_table_add(server->watcher_list, tmp, client);
4116   }
4117
4118   /* Delete nickname from watch list */
4119   if (del_nick) {
4120     if (silc_server_name_bad_chars(del_nick, strlen(del_nick)) == TRUE) {
4121       silc_server_command_send_status_reply(cmd, SILC_COMMAND_WATCH,
4122                                             SILC_STATUS_ERR_BAD_NICKNAME, 0);
4123       goto out;
4124     }
4125
4126     /* Hash the nick, we have the hash saved, not nicks because we can
4127        do one to one mapping to the nick from Client ID hash this way. */
4128     silc_to_lower(del_nick, nick, sizeof(nick) - 1);
4129     silc_hash_make(server->md5hash, nick, strlen(nick), hash);
4130
4131     /* Check that this client is watching for this nickname */
4132     if (!silc_hash_table_find_by_context(server->watcher_list, hash,
4133                                          client, (void *)&tmp)) {
4134       /* Nickname is alredy being watched for this client */
4135       silc_server_command_send_status_data(cmd, SILC_COMMAND_WATCH,
4136                                            SILC_STATUS_ERR_NO_SUCH_NICK, 0,
4137                                            2, nick, strlen(nick));
4138       goto out;
4139     }
4140
4141     /* Delete the nickname from the watcher list. */
4142     silc_hash_table_del_by_context(server->watcher_list, hash, client);
4143
4144     /* Now check whether there still exists entries with this key, if not
4145        then free the key to not leak memory. */
4146     if (!silc_hash_table_find(server->watcher_list, hash, NULL, NULL))
4147       silc_free(tmp);
4148   }
4149
4150   /* Distribute the watch list to backup routers too */
4151   if (server->backup) {
4152     SilcBuffer tmpbuf;
4153     silc_command_set_ident(cmd->payload, ++server->cmd_ident);
4154     tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4155     silc_server_backup_send(server, NULL, SILC_PACKET_COMMAND,
4156                             cmd->packet->flags, tmpbuf->data, tmpbuf->len,
4157                             FALSE, TRUE);
4158     silc_buffer_free(tmpbuf);
4159   }
4160
4161   silc_server_command_send_status_reply(cmd, SILC_COMMAND_WATCH,
4162                                         SILC_STATUS_OK, 0);
4163
4164  out:
4165   silc_free(client_id);
4166   silc_server_command_free(cmd);
4167 }
4168
4169 /* Server side of SILCOPER command. Client uses this comand to obtain router
4170    operator privileges to this router. */
4171
4172 SILC_SERVER_CMD_FUNC(silcoper)
4173 {
4174   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4175   SilcServer server = cmd->server;
4176   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4177   unsigned char *username, *auth;
4178   SilcUInt32 tmp_len;
4179   SilcServerConfigAdmin *admin;
4180   SilcIDListData idata = (SilcIDListData)client;
4181   bool result = FALSE;
4182   SilcPublicKey cached_key;
4183
4184   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
4185     goto out;
4186
4187   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_SILCOPER, cmd, 1, 2);
4188
4189   if (server->server_type != SILC_ROUTER) {
4190     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4191                                           SILC_STATUS_ERR_AUTH_FAILED, 0);
4192     goto out;
4193   }
4194
4195   /* Get the username */
4196   username = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4197   if (!username) {
4198     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4199                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
4200                                           0);
4201     goto out;
4202   }
4203
4204   /* Get the admin configuration */
4205   admin = silc_server_config_find_admin(server, cmd->sock->ip,
4206                                         username, client->nickname);
4207   if (!admin) {
4208     admin = silc_server_config_find_admin(server, cmd->sock->hostname,
4209                                           username, client->nickname);
4210     if (!admin) {
4211       silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4212                                             SILC_STATUS_ERR_AUTH_FAILED, 0);
4213       SILC_LOG_INFO(("SILCOPER authentication failed for username '%s' by "
4214                      "nickname '%s' from %s", username,
4215                      client->nickname, cmd->sock->hostname));
4216       goto out;
4217     }
4218   }
4219
4220   /* Get the authentication payload */
4221   auth = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4222   if (!auth) {
4223     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4224                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
4225                                           0);
4226     goto out;
4227   }
4228
4229   /* Verify the authentication data. If both passphrase and public key
4230      is set then try both of them. */
4231   if (admin->passphrase)
4232     result = silc_auth_verify_data(auth, tmp_len, SILC_AUTH_PASSWORD,
4233                                    admin->passphrase, admin->passphrase_len,
4234                                    idata->hash, client->id, SILC_ID_CLIENT);
4235   if (!result && admin->publickeys) {
4236     cached_key = silc_server_get_public_key(server, admin->publickeys);
4237     if (!cached_key)
4238       goto out;
4239     result = silc_auth_verify_data(auth, tmp_len, SILC_AUTH_PUBLIC_KEY,
4240                                    cached_key, 0, idata->hash,
4241                                    client->id, SILC_ID_CLIENT);
4242   }
4243   if (!result) {
4244     /* Authentication failed */
4245     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4246                                           SILC_STATUS_ERR_AUTH_FAILED, 0);
4247     goto out;
4248   }
4249
4250   /* Client is now router operator */
4251   client->mode |= SILC_UMODE_ROUTER_OPERATOR;
4252
4253   /* Update statistics */
4254   if (SILC_IS_LOCAL(client))
4255     server->stat.my_router_ops++;
4256   if (server->server_type == SILC_ROUTER)
4257     server->stat.router_ops++;
4258
4259   /* Send UMODE change to primary router */
4260   silc_server_send_notify_umode(server, SILC_PRIMARY_ROUTE(server),
4261                                 SILC_BROADCAST(server), client->id,
4262                                 client->mode);
4263
4264   /* Check if anyone is watching this nickname */
4265   if (server->server_type == SILC_ROUTER)
4266     silc_server_check_watcher_list(server, client, NULL,
4267                                    SILC_NOTIFY_TYPE_UMODE_CHANGE);
4268
4269   /* Send reply to the sender */
4270   silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4271                                         SILC_STATUS_OK, 0);
4272
4273  out:
4274   silc_server_command_free(cmd);
4275 }
4276
4277 /* Server side of command BAN. This is used to manage the ban list of the
4278    channel. To add clients and remove clients from the ban list. */
4279
4280 SILC_SERVER_CMD_FUNC(ban)
4281 {
4282   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4283   SilcServer server = cmd->server;
4284   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4285   SilcBuffer packet, list, tmp2;
4286   SilcChannelEntry channel;
4287   SilcChannelClientEntry chl;
4288   SilcChannelID *channel_id = NULL;
4289   unsigned char *id, *tmp, *atype = NULL;
4290   SilcUInt32 id_len, len, len2;
4291   SilcArgumentPayload args;
4292   SilcHashTableList htl;
4293   SilcUInt32 type;
4294   SilcUInt16 argc = 0, ident = silc_command_get_ident(cmd->payload);
4295   SilcBufferStruct blist;
4296
4297   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
4298     goto out;
4299
4300   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_BAN, cmd, 0, 3);
4301
4302   /* Get Channel ID */
4303   id = silc_argument_get_arg_type(cmd->args, 1, &id_len);
4304   if (id) {
4305     channel_id = silc_id_payload_parse_id(id, id_len, NULL);
4306     if (!channel_id) {
4307       silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4308                                             SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
4309       goto out;
4310     }
4311   }
4312
4313   /* Get channel entry. The server must know about the channel since the
4314      client is expected to be on the channel. */
4315   channel = silc_idlist_find_channel_by_id(server->local_list,
4316                                            channel_id, NULL);
4317   if (!channel) {
4318     channel = silc_idlist_find_channel_by_id(server->global_list,
4319                                              channel_id, NULL);
4320     if (!channel) {
4321       silc_server_command_send_status_data(cmd, SILC_COMMAND_BAN,
4322                                            SILC_STATUS_ERR_NO_SUCH_CHANNEL_ID,
4323                                            0, 2, id, id_len);
4324       goto out;
4325     }
4326   }
4327
4328   /* Check whether this client is on the channel */
4329   if (!silc_server_client_on_channel(client, channel, &chl)) {
4330     silc_server_command_send_status_data(cmd, SILC_COMMAND_BAN,
4331                                          SILC_STATUS_ERR_NOT_ON_CHANNEL, 0,
4332                                          2, id, id_len);
4333     goto out;
4334   }
4335
4336   /* The client must be at least channel operator. */
4337   if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) {
4338     silc_server_command_send_status_data(cmd, SILC_COMMAND_BAN,
4339                                          SILC_STATUS_ERR_NO_CHANNEL_PRIV, 0,
4340                                          2, id, id_len);
4341     goto out;
4342   }
4343
4344   /* Get the ban information */
4345   tmp = silc_argument_get_arg_type(cmd->args, 3, &len2);
4346   if (tmp && len2 > 2) {
4347     /* Parse the arguments to see they are constructed correctly */
4348     SILC_GET16_MSB(argc, tmp);
4349     args = silc_argument_payload_parse(tmp + 2, len2 - 2, argc);
4350     if (!args) {
4351       silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4352                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
4353                                             0);
4354       goto out;
4355     }
4356
4357     /* Get the type of action */
4358     atype = silc_argument_get_arg_type(cmd->args, 2, &len);
4359     if (atype && len == 1) {
4360       if (atype[0] == 0x00) {
4361         /* Allocate hash table for ban list if it doesn't exist yet */
4362         if (!channel->ban_list)
4363           channel->ban_list =
4364             silc_hash_table_alloc(0, silc_hash_ptr,
4365                                   NULL, NULL, NULL,
4366                                   silc_server_inviteban_destruct, channel,
4367                                   TRUE);
4368
4369         /* Check for resource limit */
4370         if (silc_hash_table_count(channel->ban_list) > 64) {
4371           silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4372                                                 SILC_STATUS_ERR_RESOURCE_LIMIT,
4373                                                 0);
4374           goto out;
4375         }
4376       }
4377
4378       /* Now add or delete the information. */
4379       silc_server_inviteban_process(server, channel->ban_list,
4380                                     (SilcUInt8)atype[0], args);
4381     }
4382     silc_argument_payload_free(args);
4383   }
4384
4385   /* Encode ban list */
4386   list = NULL;
4387   if (channel->ban_list && silc_hash_table_count(channel->ban_list)) {
4388     list = silc_buffer_alloc_size(2);
4389     silc_buffer_format(list,
4390                        SILC_STR_UI_SHORT(silc_hash_table_count(
4391                                           channel->ban_list)),
4392                        SILC_STR_END);
4393     silc_hash_table_list(channel->ban_list, &htl);
4394     while (silc_hash_table_get(&htl, (void *)&type, (void *)&tmp2))
4395       list = silc_argument_payload_encode_one(list, tmp2->data, tmp2->len,
4396                                               type);
4397     silc_hash_table_list_reset(&htl);
4398   }
4399
4400   /* Send BAN notify type to local servers (but not clients) and to
4401      network. */
4402   if (atype && tmp && len2) {
4403     silc_buffer_set(&blist, tmp, len2);
4404
4405     /* Send to local servers if we are router */
4406     if (server->server_type == SILC_ROUTER)
4407       silc_server_send_notify_to_channel(server, NULL, channel, FALSE, FALSE,
4408                                          SILC_NOTIFY_TYPE_BAN, 3,
4409                                          id, id_len,
4410                                          atype, 1,
4411                                          tmp ? blist.data : NULL,
4412                                          tmp ? blist.len : 0);
4413
4414     /* Send to network. */
4415     silc_server_send_notify_ban(server, SILC_PRIMARY_ROUTE(server),
4416                                 SILC_BROADCAST(server), channel, atype,
4417                                 &blist);
4418   }
4419
4420   /* Send the reply back to the client */
4421   packet =
4422     silc_command_reply_payload_encode_va(SILC_COMMAND_BAN,
4423                                          SILC_STATUS_OK, 0, ident, 2,
4424                                          2, id, id_len,
4425                                          3, list ? list->data : NULL,
4426                                          list ? list->len : 0);
4427   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4428                           packet->data, packet->len, FALSE);
4429
4430   silc_buffer_free(packet);
4431   silc_buffer_free(list);
4432
4433  out:
4434   silc_free(channel_id);
4435   silc_server_command_free(cmd);
4436 }
4437
4438 /* Server side command of LEAVE. Removes client from a channel. */
4439
4440 SILC_SERVER_CMD_FUNC(leave)
4441 {
4442   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4443   SilcServer server = cmd->server;
4444   SilcSocketConnection sock = cmd->sock;
4445   SilcClientEntry id_entry = (SilcClientEntry)cmd->sock->user_data;
4446   SilcChannelID *id = NULL;
4447   SilcChannelEntry channel;
4448   SilcUInt32 len;
4449   unsigned char *tmp;
4450
4451   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !id_entry)
4452     goto out;
4453
4454   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_LEAVE, cmd, 1, 2);
4455
4456   /* Get Channel ID */
4457   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
4458   if (!tmp) {
4459     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4460                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
4461     goto out;
4462   }
4463   id = silc_id_payload_parse_id(tmp, len, NULL);
4464   if (!id) {
4465     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4466                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
4467     goto out;
4468   }
4469
4470   /* Get channel entry */
4471   channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
4472   if (!channel) {
4473     channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
4474     if (!channel) {
4475       silc_server_command_send_status_data(cmd, SILC_COMMAND_LEAVE,
4476                                            SILC_STATUS_ERR_NO_SUCH_CHANNEL_ID,
4477                                            0, 2, tmp, len);
4478       goto out;
4479     }
4480   }
4481
4482   /* Check whether this client is on the channel */
4483   if (!silc_server_client_on_channel(id_entry, channel, NULL)) {
4484     silc_server_command_send_status_data(cmd, SILC_COMMAND_LEAVE,
4485                                          SILC_STATUS_ERR_NOT_ON_CHANNEL, 0,
4486                                          2, tmp, len);
4487     goto out;
4488   }
4489
4490   /* Notify routers that they should remove this client from their list
4491      of clients on the channel. Send LEAVE notify type. */
4492   silc_server_send_notify_leave(server, SILC_PRIMARY_ROUTE(server),
4493                                 SILC_BROADCAST(server), channel, id_entry->id);
4494
4495   silc_server_command_send_status_data(cmd, SILC_COMMAND_LEAVE,
4496                                        SILC_STATUS_OK, 0, 2, tmp, len);
4497
4498   /* Remove client from channel */
4499   if (!silc_server_remove_from_one_channel(server, sock, channel, id_entry,
4500                                            TRUE))
4501     /* If the channel does not exist anymore we won't send anything */
4502     goto out;
4503
4504   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
4505     /* Re-generate channel key */
4506     if (!silc_server_create_channel_key(server, channel, 0))
4507       goto out;
4508
4509     /* Send the channel key */
4510     silc_server_send_channel_key(server, NULL, channel,
4511                                  server->server_type == SILC_ROUTER ?
4512                                  FALSE : !server->standalone);
4513   }
4514
4515  out:
4516   silc_free(id);
4517   silc_server_command_free(cmd);
4518 }
4519
4520 /* Server side of command USERS. Resolves clients and their USERS currently
4521    joined on the requested channel. The list of Client ID's and their modes
4522    on the channel is sent back. */
4523
4524 SILC_SERVER_CMD_FUNC(users)
4525 {
4526   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4527   SilcServer server = cmd->server;
4528   SilcChannelEntry channel;
4529   SilcChannelID *id = NULL;
4530   SilcBuffer packet, idp;
4531   unsigned char *channel_id;
4532   SilcUInt32 channel_id_len;
4533   SilcBuffer client_id_list;
4534   SilcBuffer client_mode_list;
4535   unsigned char lc[4];
4536   SilcUInt32 list_count = 0;
4537   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
4538   char *channel_name;
4539
4540   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_USERS, cmd, 1, 2);
4541
4542   /* Get Channel ID */
4543   channel_id = silc_argument_get_arg_type(cmd->args, 1, &channel_id_len);
4544
4545   /* Get channel name */
4546   channel_name = silc_argument_get_arg_type(cmd->args, 2, NULL);
4547
4548   if (!channel_id && !channel_name) {
4549     silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4550                                           SILC_STATUS_ERR_NO_CHANNEL_ID, 0);
4551     goto out;
4552   }
4553
4554   if (channel_id) {
4555     id = silc_id_payload_parse_id(channel_id, channel_id_len, NULL);
4556     if (!id) {
4557       silc_server_command_send_status_data(cmd, SILC_COMMAND_USERS,
4558                                            SILC_STATUS_ERR_BAD_CHANNEL_ID, 0,
4559                                            2, channel_id, channel_id_len);
4560       goto out;
4561     }
4562   }
4563
4564   /* If we are server and we don't know about this channel we will send
4565      the command to our router. If we know about the channel then we also
4566      have the list of users already. */
4567   if (id)
4568     channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
4569   else
4570     channel = silc_idlist_find_channel_by_name(server->local_list,
4571                                                channel_name, NULL);
4572
4573   if (!channel || (!server->standalone && (channel->disabled ||
4574                     !channel->users_resolved))) {
4575     if (server->server_type != SILC_ROUTER && !server->standalone &&
4576         !cmd->pending) {
4577       SilcBuffer tmpbuf;
4578
4579       silc_command_set_ident(cmd->payload, ++server->cmd_ident);
4580       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4581
4582       /* Send USERS command */
4583       silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
4584                               SILC_PACKET_COMMAND, cmd->packet->flags,
4585                               tmpbuf->data, tmpbuf->len, TRUE);
4586
4587       /* Reprocess this packet after received reply */
4588       silc_server_command_pending(server, SILC_COMMAND_USERS,
4589                                   silc_command_get_ident(cmd->payload),
4590                                   silc_server_command_users,
4591                                   silc_server_command_dup(cmd));
4592       cmd->pending = TRUE;
4593       silc_command_set_ident(cmd->payload, ident);
4594       silc_buffer_free(tmpbuf);
4595       silc_free(id);
4596       goto out;
4597     }
4598
4599     /* Check the global list as well. */
4600     if (id)
4601       channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
4602     else
4603       channel = silc_idlist_find_channel_by_name(server->global_list,
4604                                                  channel_name, NULL);
4605     if (!channel) {
4606       /* Channel really does not exist */
4607       if (id)
4608         silc_server_command_send_status_data(
4609                                     cmd, SILC_COMMAND_USERS,
4610                                     SILC_STATUS_ERR_NO_SUCH_CHANNEL_ID, 0,
4611                                     2, channel_id, channel_id_len);
4612       else
4613         silc_server_command_send_status_data(
4614                                     cmd, SILC_COMMAND_USERS,
4615                                     SILC_STATUS_ERR_NO_SUCH_CHANNEL, 0,
4616                                     2, channel_name, strlen(channel_name));
4617       goto out;
4618     }
4619   }
4620
4621   /* If the channel is private or secret do not send anything, unless the
4622      user requesting this command is on the channel or is server */
4623   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
4624     if (channel->mode & (SILC_CHANNEL_MODE_PRIVATE | SILC_CHANNEL_MODE_SECRET)
4625         && !silc_server_client_on_channel(cmd->sock->user_data, channel,
4626                                           NULL)) {
4627       silc_server_command_send_status_data(cmd, SILC_COMMAND_USERS,
4628                                            SILC_STATUS_ERR_NO_SUCH_CHANNEL, 0,
4629                                            2, channel->channel_name,
4630                                            strlen(channel->channel_name));
4631       goto out;
4632     }
4633   }
4634
4635   /* Get the users list */
4636   if (!silc_server_get_users_on_channel(server, channel, &client_id_list,
4637                                         &client_mode_list, &list_count)) {
4638     list_count = 0;
4639     client_id_list = NULL;
4640     client_mode_list = NULL;
4641   }
4642
4643   /* List count */
4644   SILC_PUT32_MSB(list_count, lc);
4645
4646   /* Send reply */
4647   idp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4648   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_USERS,
4649                                                 SILC_STATUS_OK, 0, ident, 4,
4650                                                 2, idp->data, idp->len,
4651                                                 3, lc, 4,
4652                                                 4, client_id_list ?
4653                                                 client_id_list->data : NULL,
4654                                                 client_id_list ?
4655                                                 client_id_list->len : 0,
4656                                                 5, client_mode_list ?
4657                                                 client_mode_list->data : NULL,
4658                                                 client_mode_list ?
4659                                                 client_mode_list->len : 0);
4660   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4661                           packet->data, packet->len, FALSE);
4662
4663   silc_buffer_free(idp);
4664   silc_buffer_free(packet);
4665   if (client_id_list)
4666     silc_buffer_free(client_id_list);
4667   if (client_mode_list)
4668     silc_buffer_free(client_mode_list);
4669   silc_free(id);
4670
4671  out:
4672   silc_server_command_free(cmd);
4673 }
4674
4675 /* Server side of command GETKEY. This fetches the client's public key
4676    from the server where to the client is connected. */
4677
4678 SILC_SERVER_CMD_FUNC(getkey)
4679 {
4680   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4681   SilcServer server = cmd->server;
4682   SilcBuffer packet;
4683   SilcClientEntry client;
4684   SilcServerEntry server_entry;
4685   SilcClientID *client_id = NULL;
4686   SilcServerID *server_id = NULL;
4687   SilcIDPayload idp = NULL;
4688   SilcUInt16 ident = silc_command_get_ident(cmd->payload);
4689   unsigned char *tmp;
4690   SilcUInt32 tmp_len;
4691   SilcBuffer pk = NULL;
4692   SilcIdType id_type;
4693   SilcPublicKey public_key;
4694
4695   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4696   if (!tmp) {
4697     silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4698                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
4699                                           0);
4700     goto out;
4701   }
4702   idp = silc_id_payload_parse(tmp, tmp_len);
4703   if (!idp) {
4704     silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4705                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
4706                                           0);
4707     goto out;
4708   }
4709
4710   id_type = silc_id_payload_get_type(idp);
4711   if (id_type == SILC_ID_CLIENT) {
4712     client_id = silc_id_payload_get_id(idp);
4713
4714     /* If the client is not found from local list there is no chance it
4715        would be locally connected client so send the command further. */
4716     client = silc_idlist_find_client_by_id(server->local_list,
4717                                            client_id, TRUE, NULL);
4718     if (!client)
4719       client = silc_idlist_find_client_by_id(server->global_list,
4720                                              client_id, TRUE, NULL);
4721
4722     if ((!client && !cmd->pending && !server->standalone) ||
4723         (client && !client->connection && !cmd->pending &&
4724          !(client->mode & SILC_UMODE_DETACHED)) ||
4725         (client && !client->data.public_key && !cmd->pending)) {
4726       SilcBuffer tmpbuf;
4727       SilcUInt16 old_ident;
4728       SilcSocketConnection dest_sock;
4729
4730       dest_sock = silc_server_get_client_route(server, NULL, 0,
4731                                                client_id, NULL, NULL);
4732       if (!dest_sock)
4733         goto out;
4734
4735       old_ident = silc_command_get_ident(cmd->payload);
4736       silc_command_set_ident(cmd->payload, ++server->cmd_ident);
4737       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4738
4739       silc_server_packet_send(server, dest_sock,
4740                               SILC_PACKET_COMMAND, cmd->packet->flags,
4741                               tmpbuf->data, tmpbuf->len, TRUE);
4742
4743       /* Reprocess this packet after received reply from router */
4744       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
4745                                   silc_command_get_ident(cmd->payload),
4746                                   silc_server_command_getkey,
4747                                   silc_server_command_dup(cmd));
4748       cmd->pending = TRUE;
4749       silc_command_set_ident(cmd->payload, old_ident);
4750       silc_buffer_free(tmpbuf);
4751       goto out;
4752     }
4753
4754     if (!client) {
4755       silc_server_command_send_status_data(cmd, SILC_COMMAND_GETKEY,
4756                                            SILC_STATUS_ERR_NO_SUCH_CLIENT_ID,
4757                                            0, 2, tmp, tmp_len);
4758       goto out;
4759     }
4760
4761     /* The client is locally connected, just get the public key and
4762        send it back. If they key does not exist then do not send it,
4763        send just OK reply */
4764     public_key = client->data.public_key;
4765     if (public_key)
4766       pk = silc_pkcs_public_key_payload_encode(public_key);
4767   } else if (id_type == SILC_ID_SERVER) {
4768     server_id = silc_id_payload_get_id(idp);
4769
4770     /* If the server is not found from local list there is no chance it
4771        would be locally connected server so send the command further. */
4772     server_entry = silc_idlist_find_server_by_id(server->local_list,
4773                                                  server_id, TRUE, NULL);
4774     if (!server_entry)
4775       server_entry = silc_idlist_find_server_by_id(server->global_list,
4776                                                    server_id, TRUE, NULL);
4777
4778     if (server_entry != server->id_entry &&
4779         ((!server_entry && !cmd->pending && !server->standalone) ||
4780          (server_entry && !server_entry->connection && !cmd->pending &&
4781           !server->standalone) ||
4782          (server_entry && !server_entry->data.public_key && !cmd->pending &&
4783           !server->standalone))) {
4784       SilcBuffer tmpbuf;
4785       SilcUInt16 old_ident;
4786
4787       old_ident = silc_command_get_ident(cmd->payload);
4788       silc_command_set_ident(cmd->payload, ++server->cmd_ident);
4789       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4790
4791       silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
4792                               SILC_PACKET_COMMAND, cmd->packet->flags,
4793                               tmpbuf->data, tmpbuf->len, TRUE);
4794
4795       /* Reprocess this packet after received reply from router */
4796       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
4797                                   silc_command_get_ident(cmd->payload),
4798                                   silc_server_command_getkey,
4799                                   silc_server_command_dup(cmd));
4800       cmd->pending = TRUE;
4801       silc_command_set_ident(cmd->payload, old_ident);
4802       silc_buffer_free(tmpbuf);
4803       goto out;
4804     }
4805
4806     if (!server_entry) {
4807       silc_server_command_send_status_data(cmd, SILC_COMMAND_GETKEY,
4808                                            SILC_STATUS_ERR_NO_SUCH_SERVER_ID,
4809                                            0, 2, tmp, tmp_len);
4810       goto out;
4811     }
4812
4813     /* If they key does not exist then do not send it, send just OK reply */
4814     public_key = (!server_entry->data.public_key ?
4815                   (server_entry == server->id_entry ? server->public_key :
4816                    NULL) : server_entry->data.public_key);
4817     if (public_key)
4818       pk = silc_pkcs_public_key_payload_encode(public_key);
4819   } else {
4820     goto out;
4821   }
4822
4823   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4824   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_GETKEY,
4825                                                 SILC_STATUS_OK, 0, ident, 2,
4826                                                 2, tmp, tmp_len,
4827                                                 3, pk ? pk->data : NULL,
4828                                                 pk ? pk->len : 0);
4829   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4830                           packet->data, packet->len, FALSE);
4831   silc_buffer_free(packet);
4832
4833  out:
4834   if (idp)
4835     silc_id_payload_free(idp);
4836   silc_buffer_free(pk);
4837   silc_free(client_id);
4838   silc_free(server_id);
4839   silc_server_command_free(cmd);
4840 }
4841
4842
4843 /* Private range commands, specific to this implementation */
4844
4845 /* Server side command of CONNECT. Connects us to the specified remote
4846    server or router. */
4847
4848 SILC_SERVER_CMD_FUNC(connect)
4849 {
4850   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4851   SilcServer server = cmd->server;
4852   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4853   unsigned char *tmp, *host;
4854   SilcUInt32 tmp_len;
4855   SilcUInt32 port = SILC_PORT;
4856
4857   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
4858     goto out;
4859
4860   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_PRIV_CONNECT, cmd, 1, 2);
4861
4862   /* Check whether client has the permissions. */
4863   if (!(client->mode & SILC_UMODE_SERVER_OPERATOR) &&
4864       !(client->mode & SILC_UMODE_ROUTER_OPERATOR)) {
4865     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_CONNECT,
4866                                           SILC_STATUS_ERR_NO_SERVER_PRIV, 0);
4867     goto out;
4868   }
4869
4870   if (server->server_type == SILC_ROUTER && !server->backup_router &&
4871       client->mode & SILC_UMODE_SERVER_OPERATOR) {
4872     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_CONNECT,
4873                                           SILC_STATUS_ERR_NO_ROUTER_PRIV, 0);
4874     goto out;
4875   }
4876
4877   /* Get the remote server */
4878   host = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4879   if (!host) {
4880     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_CONNECT,
4881                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
4882                                           0);
4883     goto out;
4884   }
4885
4886   /* Get port */
4887   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4888   if (tmp)
4889     SILC_GET32_MSB(port, tmp);
4890
4891   /* Create the connection. It is done with timeout and is async. */
4892   silc_server_create_connection(server, host, port);
4893
4894   /* Send reply to the sender */
4895   silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_CONNECT,
4896                                         SILC_STATUS_OK, 0);
4897
4898  out:
4899   silc_server_command_free(cmd);
4900 }
4901
4902 /* Server side command of CLOSE. Closes connection to a specified server. */
4903
4904 SILC_SERVER_CMD_FUNC(close)
4905 {
4906   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4907   SilcServer server = cmd->server;
4908   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4909   SilcServerEntry server_entry;
4910   SilcSocketConnection sock;
4911   unsigned char *tmp;
4912   SilcUInt32 tmp_len;
4913   unsigned char *name;
4914   SilcUInt32 port = SILC_PORT;
4915
4916   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
4917     goto out;
4918
4919   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_PRIV_CLOSE, cmd, 1, 2);
4920
4921   /* Check whether client has the permissions. */
4922   if (!(client->mode & SILC_UMODE_SERVER_OPERATOR) &&
4923       !(client->mode & SILC_UMODE_ROUTER_OPERATOR)) {
4924     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_CLOSE,
4925                                           SILC_STATUS_ERR_NO_SERVER_PRIV,
4926                                           0);
4927     goto out;
4928   }
4929
4930   /* Get the remote server */
4931   name = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4932   if (!name) {
4933     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_CLOSE,
4934                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS,
4935                                           0);
4936     goto out;
4937   }
4938
4939   /* Get port */
4940   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4941   if (tmp)
4942     SILC_GET32_MSB(port, tmp);
4943
4944   server_entry = silc_idlist_find_server_by_conn(server->local_list,
4945                                                  name, port, FALSE, NULL);
4946   if (!server_entry)
4947     server_entry = silc_idlist_find_server_by_conn(server->global_list,
4948                                                    name, port, FALSE, NULL);
4949   if (!server_entry) {
4950     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_CLOSE,
4951                                           SILC_STATUS_ERR_NO_SERVER_ID, 0);
4952     goto out;
4953   }
4954
4955   if (server_entry == server->id_entry) {
4956     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_CLOSE,
4957                                           SILC_STATUS_ERR_NO_SERVER_ID, 0);
4958     goto out;
4959   }
4960
4961   /* Send reply to the sender */
4962   silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_CLOSE,
4963                                         SILC_STATUS_OK, 0);
4964
4965   /* Close the connection to the server */
4966   sock = (SilcSocketConnection)server_entry->connection;
4967
4968   server->backup_noswitch = TRUE;
4969   if (server->router == server_entry) {
4970     server->id_entry->router = NULL;
4971     server->router = NULL;
4972     server->standalone = TRUE;
4973   }
4974   silc_server_disconnect_remote(server, sock,
4975                                 SILC_STATUS_ERR_BANNED_FROM_SERVER,
4976                                 "Closed by administrator");
4977   if (sock->user_data)
4978     silc_server_free_sock_user_data(server, sock, NULL);
4979   server->backup_noswitch = FALSE;
4980
4981  out:
4982   silc_server_command_free(cmd);
4983 }
4984
4985 /* Server side command of SHUTDOWN. Shutdowns the server and closes all
4986    active connections. */
4987
4988 SILC_SERVER_CMD_FUNC(shutdown)
4989 {
4990   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4991   SilcServer server = cmd->server;
4992   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4993
4994   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT || !client)
4995     goto out;
4996
4997   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_PRIV_SHUTDOWN, cmd, 0, 0);
4998
4999   /* Check whether client has the permission. */
5000   if (!(client->mode & SILC_UMODE_SERVER_OPERATOR) &&
5001       !(client->mode & SILC_UMODE_ROUTER_OPERATOR)) {
5002     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_SHUTDOWN,
5003                                           SILC_STATUS_ERR_NO_SERVER_PRIV,
5004                                           0);
5005     goto out;
5006   }
5007
5008   /* Send reply to the sender */
5009   silc_server_command_send_status_reply(cmd, SILC_COMMAND_PRIV_SHUTDOWN,
5010                                         SILC_STATUS_OK, 0);
5011
5012   /* Then, gracefully, or not, bring the server down. */
5013   silc_server_stop(server);
5014   exit(0);
5015
5016  out:
5017   silc_server_command_free(cmd);
5018 }